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83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count preliminary specification supersedes data of 1998 jan 06 ic20 data handbook 1998 apr 23 integrated circuits
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 2 1998 apr 23 description the philips 83c749/87c749 offers many of the advantages of the 80c51 architecture in a small package and at low cost. the 8xc749 microcontroller is fabricated with philips high-density cmos technology. philips epitaxial substrate minimizes cmos latch-up sensitivity. the 8xc749 contains a 2k 8 rom (83c749) eprom (87c749), a 64 8 ram, 21 i/o lines, a 16-bit auto-reload counter/timer, a fixed-priority level interrupt structure, an on-chip oscillator, a five channel multiplexed 8-bit a/d converter, and an 8-bit pwm output. the eprom version of this device, the 87c749, is available in plastic one-time programmable (otp) packages. once the array has been programmed, it is functionally equivalent to the masked rom 83c749. thus, unless explicitly stated otherwise, all references made to the 83c749 apply equally to the 87c749. the 83c749 supports two power reduction modes of operation referred to as the idle mode and the power-down mode. features ? available in erasable quartz lid or one-time programmable plastic packages ? 80c51 based architecture ? small package sizes 28-pin dip 28-pin shrink small outline package (ssop) 28-pin plcc ? wide oscillator frequency range: 3.5mhz to 16mhz ? low power consumption: normal operation: less than 11ma @ 5v, 12mhz idle mode power-down mode ? 2k 8 rom (83c749) eprom (87c749) ? 64 8 ram ? 16-bit auto reloadable counter/timer ? 5-channel 8-bit a/d converter ? 8-bit pwm output/timer ? 10-bit fixed-rate timer ? boolean processor ? cmos and ttl compatible ? well suited for logic replacement, consumer and industrial applications part number selection rom eprom 1 temperature range c and package frequency drawing number p83c749ebp n p87c749ebp n otp 0 to +70, 28-pin plastic dual in-line package 3.5 to 16mhz sot117-2 p83c749eba a p87c749eba a otp 0 to +70, 28-pin plastic leaded chip carrier 3.5 to 16mhz sot261-3 p83c749ebd db p87c749ebd db otp 0 to +70, 28-pin shrink small outline package 3.5 to 16mhz sot341-1 note: 1. otp = one time programmable eprom.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 3 block diagram rst x1 x2 v cc v ss ram rom/ eprom acc tmp2 tmp1 alu instruction register pd oscillator psw buffer dptr pcon tcon ie th0 tl0 rth rtl interrupt and timer blocks pwm p1.0p1.7 p3.0p3.7 p0.0p0.4 adc av ss av cc port 0 drivers ram addr register port 0 latch port 2 latch stack pointer program address register pc incre- menter program counter port 3 drivers port 1 drivers port 3 latch port 1 latch timing and control b register su00305
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 4 pin configuration 1 2 3 4 5 6 7 8 9 10 11 12 14 13 15 16 17 18 19 20 21 22 23 24 p3.4/a4 p3.3/a3 p3.2/a2/a10 p3.1/a1/a9 p3.0/a0/a8 p0.2/v pp rst x2 x1 v ss p0.0/asel p1.4/adc4/d4 av ss av cc p1.5/int0 /d5 p1.6/int1 /d6 p1.7/t0/d7 p0.3 p0.4/pwm out p3.7/a7 p3.6/a6 p3.5/a5 v cc plastic dual in-line package and shrink small outline package plastic leaded chip carrier 4126 5 11 25 19 12 18 p0.1/oepgm 25 26 27 28 p1.0/adc0/d0 p1.1/adc1/d1 p1.3/adc3/d3 p1.2/adc2/d2 pin function 1 p3.4/a4 2 p3.3/a3 3 p3.2/a2/a10 4 p3.1/a1/a9 5 p3.0/a0/a8 6 p0.2/v pp 7 p0.1/oe-pgm 8 p0.0/asel 9 rst 10 x2 11 x1 12 v ss 13 p1.0/adc0/d0 14 p1.1/adc1/d1 pin function 15 p1.2/adc2/d2 16 p1.3/adc3/d3 17 p1.4/adc4/d4 18 av ss 19 av cc 20 p1.5/int0 /d5 21 p1.6/int1 /d6 22 p1.7/t0/d7 23 p0.3 24 p0.4/pwm out 25 p3.7/a7 26 p3.6/a6 27 p3.5/a5 28 v cc su00304
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 5 pin description mnemonic pin no. type name and function v ss 12 i circuit ground potential. v cc 28 i supply voltage during normal, idle, and power-down operation. p0.0p0.4 86 23, 24 i/o port 0: port 0 is a 5-bit bidirectional port. port 0.0p0.2 are open drain. port 0.0p0.2 pins that have 1s written to them float, and in that state can be used as high-impedance inputs. p0.3p0.4 are bidirectional i/o port pins with internal pull-ups. these pins are driven low if the port register bit is written with a 0. the state of the pin can always be read from the port register by the program. port 0.3 and 0.4 have internal pull-ups that function identically to port 3. pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. while p0.0 anbd p0.1 differ from astandard ttlo characteristics, they are close enough for the pins to still be used as general-purpose i/o. 6 i v pp (p0.2) programming voltage input. (see note 2.) 7 i oe/pgm (p0.1) input which specifies verify mode (output enable) or the program mode. oe/pgm = 1 output enabled (verify mode). oe/pgm = 0 program mode. 8 i asel (p0.0) input which indicates which bits of the eprom address are applied to port 3. asel = 0 low address byte available on port 3. asel = 1 high address byte available on port 3 (only the three least significant bits are used). p1.0p1.7 1317, 2022 i/o port 1: port 1 is an 8-bit bidirectional i/o port with internal pull-ups. port 1 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. p0.3p0.4 pins are bidirectional i/o port pins with internal pull-ups. as inputs, port 1 pins that are externally pulled low will source current because of the internal pull-ups. (see dc electrical characteristics: i il ). port 1 also serves the special function features of the sc80c51 family as listed below: 20 i int0 (p1.5): external interrupt. 21 i int1 (p1.6): external interrupt. 22 i t0 (p1.7): timer 0 external input. 1317 i adc0 (p1.0)adc4 (p1.4): port 1 also functions as the inputs to the five channel multiplexed a/d converter. these pins can be used as outputs only if the a/d function has been disabled. these pins can be used as digital inputs while the a/d converter is enabled. port 1 serves to output the addressed eprom contents in the verify mode and accepts as inputs the value to program into the selected address during the program mode. p3.0p3.7 51, 2725 i/o port 3: port 3 is an 8-bit bidirectional i/o port with internal pull-ups. port 3 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. as inputs, port 3 pins that are externally being pulled low will source current because of the pull-ups. (see dc electrical characteristics: i il ). port 3 also functions as the address input for the eprom memory location to be programmed (or verified). the 11-bit address is multiplexed into this port as specified by p0.0/asel. rst 9 i reset: a high on this pin for two machine cycles while the oscillator is running resets the device. an internal diffused resistor to v ss permits a power-on reset using only an external capacitor to v cc . after the device is reset, a 10-bit serial sequence, sent lsb first, applied to reset, places the device in the programming state allowing programming address, data and v pp to be applied for programming or verification purposes. the reset serial sequence must be synchronized with the x1 input. x1 11 i crystal 1: input to the inverting oscillator amplifier and input to the internal clock generator circuits. x1 also serves as the clock to strobe in a serial bit stream into reset to place the device in the programming state. x2 10 o crystal 2: output from the inverting oscillator amplifier. av cc 1 19 i analog supply voltage and reference input. av ss 1 18 i analog supply and reference ground. note: 1. av ss (reference ground) must be connected to 0v (ground). av cc (reference input) cannot differ from v cc by more than 0.2v, and must be in the range 4.5v to 5.5v. 2. when p0.2 is at or close to 0 volt, it may affect the internal rom operation. we recommend that p0.2 be tied to v cc via a small pullup (e.g., 2k w ).
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 6 oscillator characteristics x1 and x2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator. to drive the device from an external clock source, x1 should be driven while x2 is left unconnected. there are no requirements on the duty cycle of the external clock signal, because the input to the internal clock circuitry is through a divide-by-two flip-flop. however, minimum and maximum high and low times specified in the data sheet must be observed. idle mode the 8xc749 includes the 80c51 power-down and idle mode features. in idle mode, the cpu puts itself to sleep while all of the on-chip peripherals except the a/d and pwm stay active. the functions that continue to run while in the idle mode are timer 0, timer i, and the interrupts. the instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. the cpu contents, the on-chip ram, and all of the special function registers remain intact during this mode. the idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset. upon powering-up the circuit, or exiting from idle mode, sufficient time must be allowed for stabilization of the internal analog reference voltages before an a/d conversion is started. special function registers the special function registers (directly addressable only) contain all of the 8xc751 registers except the program counter and the four register banks. most of the 21 special function registers are used to control the on-chip peripheral hardware. other registers include arithmetic registers (acc, b, psw), stack pointer (sp) and data pointer registers (dph, dpl). nine of the sfrs are bit addressable. data pointer the data pointer (dptr) consists of a high byte (dph) and a low byte (dpl). in the 80c51 this register allows the access of external data memory using the movx instruction. since the 83c749 does not support movx or external memory accesses, this register is generally used as a 16-bit offset pointer of the accumulator in a movc instruction. dptr may also be manipulated as two independent 8-bit registers. power-down mode in the power-down mode, the oscillator is stopped and the instruction to invoke power-down is the last instruction executed. only the contents of the on-chip ram are preserved. a hardware reset is the only way to terminate the power-down mode. the control bits for the reduced power modes are in the special function register pcon. table 1. external pin status during idle and power-down modes mode port 0* port 1 port 2 idle data data data power-down data data data * except for pwm output (p0.4). differences between the 8xc749 and the 80c51 program memory on the 8xc749, program memory is 2048 bytes long and is not externally expandable, so the 80c51 instructions movx, ljmp, and lcall are not implemented. if these instructions are executed, the appropriate number of instruction cycles will take place along with external fetches; however, no operation will take place. the ljmp may not respond to all program address bits. the only fixed locations in program memory are the addresses at which execution is taken up in response to reset and interrupts, which are as follows: program memory event address reset 000 external int0 003 counter/timer 0 00b external int1 013 timer i 01b adc 02b pwm 033 memory organization the 8xc749 manipulates operands in three memory address spaces. the first is the program memory space which contains program instructions as well as constants such as look-up tables. the program memory space contains 2k bytes in the 8xc749. the second memory space is the data memory array which has a logical address space of 128 bytes. however, only the first 64 (0 to 3fh) are implemented in the 8xc749. the third memory space is the special function register array having a 128-byte address space (80h to ffh). only selected locations in this memory space are used (see table 2). note that the architecture of these memory spaces (internal program memory, internal data memory, and special function registers) is identical to the 80c51, and the 8xc749 varies only in the amount of memory physically implemented. the 8xc749 does not directly address any external data or program memory spaces. for this reason, the movx instructions in the 80c51 instruction set are not implemented in the 83c749, nor are the alternate i/o pin functions rd and wr . i/o ports the i/o pins provided by the 83c749 consist of port 0, port 1, and port 3. port 0 port 0 is a 5-bit bidirectional i/o port and includes alternate functions on some pins of this port. pins p0.3 and p0.4 are provided with internal pullups while the remaining pins (p0.0, p0.1, and p0.2) have open drain output structures. the alternate function for port p0.4 is pwm output. if the alternate function pwm is not being used, then this pin may be used as an i/o port.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 7 port 1 port 1 is an 8-bit bidirectional i/o port whose structure is identical to the 80c51, but also includes alternate input functions on all pins. the alternate pin functions for port 1 are: p1.0-p1.4 - adc0-adc4 - a/d converter analog inputs p1.5 int0 - external interrupt 0 input p1.6 int1 - external interrupt 1 input p1.7 - t0 - timer 0 external input if the alternate functions int0 , int1 , or t0 are not being used, these pins may be used as standard i/o ports. it is necessary to connect av cc and av ss to v cc and v ss , respectively, in order to use p1.5, p1.6, and p1.7 pins as standard i/o pins. when the a/d converter is enabled, the analog channel connected to the a/d may not be used as a digital input; however, the remaining analog inputs may be used as digital inputs. they may not be used as digital outputs. while the a/d is enabled, the analog inputs are floating. port 3 port 3 is an 8-bit bidirectional i/o port whose structure is identical to the 80c51. note that the alternate functions associated with port 3 of the 80c51 have been moved to port 1 of the 83c749 (as applicable). see figure 1 for port bit configurations. counter/timer subsystem the 8xc749 has one counter/timer called timer/counter 0. its operation is similar to mode 2 operation on the 80c51, but is extended to 16 bits with 16 bits of autoload. the controls for this counter are centralized in a single register called tcon. timer i implementation timer i is clocked once per machine cycle, which is the oscillator frequency divided by 12. the timer operation is enabled by setting the tirun bit (bit 4) in the i2cfg register. writing a 0 into the tirun bit will stop and clear the timer. the timer is 10 bits wide, and when it reaches the terminal count of 1024, it carries out and sets the timer i interrupt flag. an interrupt will occur if the timer i interrupt is enabled by bit eti (bit 4) of the interrupt enable (ie) register, and global interrupts are enabled by bit ea (bit 7) of the same ie register. the vector address for the timer i interrupt is 1bhex, and the interrupt service routine must start at this address. as with all 8051 family microcontrollers, only the program counter is pushed onto the stack upon interrupt (other registers that are used both by the interrupt service routine and elsewhere must be explicitly saved). the timer i interrupt flag is cleared by setting the ckrti bit (bit 5 of the i1cfg register. for more information, see application note an427. interrupt subsystemefixed priority the ip register and the 2-level interrupt system of the 80c51 are eliminated. the interrupt structure is a seven-source, one-level interrupt system similar to the 8xc751. simultaneous interrupt conditions are resolved by a single-level, fixed priority as follows: highest priority: pin int0 counter/timer flag 0 pin int1 pwm timer i lowest priority: adc the vector addresses are as follows: source vector address int0 0003h tf0 000bh int1 0013h timer i 001bh adc 002bh pwm 0033h interrupt control registers the 80c51 interrupt enable register is modified to take into account the different interrupt sources of the 8xc749. interrupt enable register msb lsb ea ead eti e epwm ex1 et0 ex0 position symbol function ie.7 ea global interrupt disable when ea = 0 ie.6 ead a/d conversion complete ie.5 eti timer i ie.4 e ie.3 epwm pwm c ounter overflow ie.2 ex1 external interrupt 1 ie.1 et0 timer 0 overflow ie.0 ex0 external interrupt 0 p1.x latch dq cl q read latch int. bus write to latch read pin alternate input function v dd p1.x pin internal pull-up alternate output function p0.x latch dq cl q read latch int. bus write to latch read pin alternate input function p0.x pin alternate output function su00306 figure 1. port bit latches and i/o buffers
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 8 pulse width modulation output (p0.4) the pwm outputs pulses of programmable length and interval. the repetition frequency is defined by an 8-bit prescaler which generates the clock for the counter. the prescaler register is pwmp. the prescaler and counter are not associated with any other timer. the 8-bit counter counts modulo 255, that is from 0 to 254 inclusive. the value of the 8-bit counter is compared to the contents of a compare register, pwm. when the counter value matches the contents of this register, the output of the pwm is set high. when the counter reaches zero, the output of the pwm is set low. the pulse width ratio (duty cycle) is defined by the contents of the compare register and is in the range of 0 to 1 programmed in increments of 1/255. the pwm output can be set to be continuously high by loading the compare register with 0 and the output can be set to be continuously low by loading the compare register with 255. the pwm output is enabled by a bit in a special function register, pwena. when enabled, the pin output is driven with a fully active pull-up. that is, when the output is high, a strong pull-up is continuously applied. when disabled, the pin functions as a normal bidirectional i/o pin, however, the counter remains active. the pwm function is disabled during reset and remains disabled after reset is removed until re-enabled by software. the pwm output is high during power down and idle. the counter is disabled during idle. the repetition frequency of the pwm is given by: f pwm = f osc / 2 (1 + pwmp) 255 the low/high ratio of the pwm signal is pwm / (255 pwm) for pwm not equal to 255. for pwm = 255, the output is always low. the repetition frequency range is 92hz to 23.5khz for an oscillator frequency of 12mhz. an interrupt will be asserted upon pwm counter overflow if the interrupt is not masked off. the pwm output is an alternative function of p0.4. in order to use this port as a bidirectional i/o port, the pwm output must be disabled by clearing the enable/disable bit in pwena. in this case, the pwm subsystem can be used as an interval timer by enabling the pwm interrupt. special function register addresses special function registers for the 8xc749 are identical to those of the 80c51, except for the changes listed below: 80c51 special function registers not present in the 8xc749 are tmod (89), p2 (a0) and ip (b8). additional special function registers are adcon (a0), adat (84), pwm (8e), pwmp (8f), and pwena (fe). a/d converter the analog input circuitry consists of a 5-input analog multiplexer and an a to d converter with 8-bit resolution. the conversion takes 40 machine cycles, i.e., 40 m s at 12mhz oscillator frequency. the a/d converter is controlled using the adcon control register. input channels are selected by the analog multiplexer through adcon register bits 02. the 83c749 contains a five-channel multiplexed 8-bit a/d converter. the conversion requires 40 machine cycles (40 m s at 12mhz oscillator frequency). the a/d converter is controlled by the a/d control register, adcon. input channels are selected by the analog multiplexer by bits adcon.0 through adcon.2. the adcon register is not bit addressable. adcon register msb lsb x x enadc adci adcs aadr2 aadr1 aadr0 adci adcs operation 0 0 adc not busy, a conversion can be started. 0 1 adc busy, start of a new conversion is blocked. 1 0 conversion completed, start of a new conversion is blocked. 1 1 not possible. input channel selection addr2 addr1 addr0 input pin 0 0 0 p1.0 0 0 1 p1.1 0 1 0 p1.2 0 1 1 p1.3 1 0 0 p1.4 position symbol function adcon.5 enadc enable a/d function when enadc = 1. reset forces enadc = 0. adcon.4 adci adc interrupt flag. this flag is set when an adc conversion is complete. if ie.6 = 1, an interrupt is requested when adci = 1. the adci flag is cleared when conversion data is read. this flag is read only. adcon.3 adcs adc start. setting this bit starts an a/d conversion. once set, adcs remains high throughout the conversion cycle. on completion of the conversion, it is reset just before the adci interrupt flag is cleared. adcs cannot be reset by software. adcs should not be used to monitor the a/d converter status. adci should be used for this purpose. adcon.2 aadr2 analog input select. adcon.1 aadr1 analog input select. adcon.0 aadr0 analog input select. this binary coded address selects one of the five analog input port pins of p1 to be input to the converter. it can only be changed when adci and adcs are both low. aadr2 is the most significant bit. the completion of the 8-bit adc conversion is flagged by adci in the adcon register, and the result is stored in the special function register adat. an adc conversion in progress is unaffected by an adc start. the result of a completed conversion remains unaffected provided adci remains at a logic 1. while adcs is a logic 1 or adci is a logic 1, a new adc start will be blocked and consequently lost. an adc conversion in progress is aborted when the idle or power-down mode is entered. the result of a completed conversion (adci = logic 1) remains unaffected when entering the idle mode. see figure 2 for an a/d input equivalent circuit. the analog input pins adc0-adc4 may be used as digital inputs and outputs when the a/d converter is disabled by a 0 in the enadc bit in adcon. when the a/d is enabled, the analog input channel that is selected by the addr2-addr0 bits in adcon cannot be used as a digital input. reading the selected a/d channel as a digital input will always return a 1. the unselected a/d inputs
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 9 may always be used as digital inputs. unselected analog inputs will be floating and may not be used as digital outputs. the a/d reference inputs on the 8xc749 are tied together with the analog supply pins av cc and av ss . this means that the reference voltage on the a/d cannot be varied separately from the analog supply pins. av ss must be connected to 0v and av cc must be connected to a supply voltage between 4.5v and 5.5v. a/d measurements may be made in the range of 4.5v to 5.5v. increasing the voltage on the a/d ground reference above 0v or reducing the voltage on the positive a/d reference below 4.5v is not permitted. table 2. 8xc749 special function registers symbol description direct address bit address, symbol, or alternative port function msb lsb reset value acc* accumulator e0h e7 e6 e5 e4 e3 e2 e1 e0 00h adat# a/d result 84h 00h adcon# a/d control a0h enadc adci adcs aadr2 aadr1 aadr0 c0h b* b register f0h f7 f6 f5 f4 f3 f2 f1 f0 00h dptr: dpl dph data pointer (2 bytes) data pointer low data pointer high 82h 83h 00h 00h af ae ad ac ab aa a9 a8 ie*# interrupt enable adh ea ead eti e epwm ex1 et0 ex0 00h 84 83 82 81 80 p0*# port 0 80h pwm0 xxx1 1111b 97 96 95 94 93 92 91 90 ffh p1*# port 1 90h t0 int1 int0 adc4 adc3 adc2 adc1 adc0 p3* port 3 b0h b7 b6 b5 b4 b3 b2 b1 b0 ffh pcon# power control 87h pd idl xxxx0000b d7 d6 d5 d4 d3 d2 d1 d0 psw* program status word d0h cy ac f0 rs1 rs0 ov p 00h pwcm# pwm compare 8eh xxxxxxxxb pwena# pwm enable feh pwe feh pwmp# pwm prescaler 8fh 00h rtl# timer low reload 8bh 00h rth# timer high reload 8dh 00h sp stack pointer 81h 07h tl# timer low 8ah 00h th# timer high 8ch 00h df de dd dc db da d9 d8 ticon*# timer i control d8h/rd 0 tirun 0000xx00b wr clrti tirun 8f 8e 8d 8c 8b 8a 89 88 tcon*# timer control 88h gate c/t tf tr ie0 it0 ie1 it1 00h * sfrs are bit addressable. # sfrs are modified from or added to the 80c51 sfrs.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 10 r s v analog input c s c c to comparator + i n i n+1 sm n+1 sm n rm n+1 rm n multiplexer rm = 0.5 - 3 k w cs + cc = 15pf maximum rs = recommended < 9.6 k w for 1 lsb @ 12mhz note: because the analog to digital converter has a sampled-data comparator, the input looks capacitive to a source. when a conversio n is initiated, switch sm closes for 8tcy (8 m s @ 12mhz crystal frequency) during which time capacitance cs + cc is charged. it should be noted that the sampling causes the analog input to present a varying load to an analog source. su00199 figure 2. a/d input: equivalent circuit a/d converter parameter definitions the following definitions are included to clarify some specifications given and do not represent a complete set of a/d parameter definitions. absolute accuracy error absolute accuracy error of a given output is the difference between the theoretical analog input voltage to produce a given output and the actual analog input voltage required to produce the same code. since the same output code is produced by a band of input voltages, the arequired input voltageo is defined as the midpoint of the band of input voltage that will produce that code. absolute accuracy error not specified with a code is the maximum over all codes. nonlinearity if a straight line is drawn between the end points of the actual converter characteristics such that zero offset and full scale errors are removed, then non-linearity is the maximum deviation of the code transitions of the actual characteristics from that of the straight line so constructed. this is also referred to as relative accuracy and also integral non-linearity. differential non-linearity differential non-linearity is the maximum difference between the actual and ideal code widths of the converter. the code widths are the differences expressed in lsb between the code transition points, as the input voltage is varied through the range for the complete set of codes. gain error gain error is the deviation between the ideal and actual analog input voltage required to cause the final code transition to a full-scale output code after the offset error has been removed. this may sometimes be referred to as full scale error. offset error offset error is the difference between the actual input voltage that causes the first code transition and the ideal value to cause the first code transition. this ideal value is 1/2 lsb above v ref . channel to channel matching channel to channel matching is the maximum difference between the corresponding code transitions of the actual characteristics taken from different channels under the same temperature, voltage and frequency conditions. crosstalk crosstalk is the measured level of a signal at the output of the converter resulting from a signal applied to one deselected channel. total error maximum deviation of any step point from a line connecting the ideal first transition point to the ideal last transition point. relative accuracy relative accuracy error is the deviation of the adc's actual code transition points from the ideal code transition points on a straight line which connects the ideal first code transition point and the final code transition point, after nullifying offset error and gain error. it is generally expressed in lsbs or in percent of fsr.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 11 counter/timer the 8xc749 counter/timer is designated timer 0 and is separate from timer i and from the pwm. its operation is similar to mode 2 of the 80c51 counter/timer, extended to 16 bits. when timer 0 is used in the external counter mode, the t0 input (p1.7) is sampled every s4p1. the counter/timer function is controlled using the timer control register (tcon). tcon register msb lsb gate c/t tf tr ie0 it0 ie1 it1 position symbol function tcon.7 gate 1 timer 0 is enabled only when int0 pin is high and tr is 1. 0 timer 0 is enabled only when tr is 1. tcon.6 c/t 1 counter operation from t0 pin. 0 timer operation from internal clock. tcon.5 tf 1 set on overflow of t0. 0 cleared when processor vectors to interrupt routine and by reset. tcon.4 tr 1 enable timer 0 0 disable timer 0 tcon.3 ie0 1 edge detected on int0 tcon.2 it0 1 int0 is edge triggered. 0 int0 is level sensitive. tcon.1 ie1 1 edge detected on int1 tcon.0 it1 1 int1 is edge triggered. 0 int1 is level sensitive. these flags are functionally identical to the corresponding 80c51 flags except that there is only one of the 80c51 style timers, and the flags are combined into one register. note that the positions of the ie0/it0 and ie1/it1 bits are transposed from the positions used in the standard 80c51 tcon register. timer i may be used as a fixed time base timer or watchdog timer. timer t0 is a 16-bit autoreloadable timer/counter, that operates similar to mode 2 operation on the 80c51, but is extended to 16 bits. the timer/counter is clocked by either 1/12 the oscillator frequency or by transitions on the t0 pin. the c/t bit in special function register tcon selects between these two modes. when the tcon tr bit is set, the timer/counter is enabled. register pair th and tl are incremented by the clock source. when the register pair overflows, the register pair is reloaded with the values in registers rth and rtl. the value in the reload registers is left unchanged. the tf bit in special function register tcon is set on counter overflow and, if the interrupt is enabled, will generate an interrupt (see figure 3). osc 12 tl th tf rtl rth t0 pin tr gate int0 pin int. c/t = 0 c/t = 1 reload su00300 figure 3. 83c749 counter/timer block diagram absolute maximum ratings 1, 3, 4 parameter rating unit storage temperature range 65 to +150 c voltage from v cc to v ss 0.5 to +6.5 v voltage from any pin to v ss (except v pp ) 0.5 to v cc + 0.5 v power dissipation 1.0 w voltage from v pp pin to v ss 0.5 to + 13.0 v notes on page 13.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 12 dc electrical characteristics t amb = 0 c to +70 c, av cc = 5v 5, av ss = 0v 4 v cc = 5v 10%, v ss = 0v test limits 4 symbol parameter conditions min typ 1 max unit i cc supply current (see figure 6) inputs v il input low voltage (0 to 70 c) 0.5 0.2v cc 0.1 v v ih input high voltage, except x1, rst (0 to 70 c) 0.2v cc +0.9 v cc +0.5 v v ih1 input high voltage, x1, rst (0 to 70 c) 0.7v cc v cc +0.5 v p0.2 v il1 input low voltage (0 to 70 c) 0.5 0.3v cc v v ih2 input high voltage (0 to 70 c) 0.7v cc v cc +0.5 v outputs v ol output low voltage, ports 1, 3, 0.3, and 0.4 (pwm disabled) i ol = 1.6ma 2 0.45 v v ol1 output low voltage, port 0.2 i ol = 3.2ma 2 0.45 v v oh output high voltage, ports 1, 3, 0.3, and 0.4 (pwm disabled) i oh = 60 m a, 2.4 v i oh = 25 m a 0.75v cc v i oh = 10 m a 0.9v cc v i oh = 400 m a 2.4 v v oh2 output high voltage, p0.4 (pwm enabled) i oh = 40 m a 0.9v cc v port 0.0 and 0.1 drivers i ol = 3ma (v ) v ol2 output low voltage (over v cc range) 0.4 v c driver, receiver combined: capacitance 10 pf i il logical 0 input current, ports 1, 3, 0.3, and 0.4 (pwm disabled) 11 v in = 0.45v (0 to 70 c) 50 m a i tl logical 1 to 0 transition current, ports 1, 3, 0.3 and 0.4 11 v in = 2v (0 to 70 c) 650 m a i li input leakage current, port 0.0, 0.1 and 0.2 0.45 < v in < v cc 10 m a r rst reset pull-down resistor 25 175 k w c io pin capacitance test freq = 1mhz, t amb = 25 c 10 pf i pd power-down current 5 v cc = 2 to 5.5v v cc = 2 to 6.0v (83c749) 50 m a v pp v pp program voltage (87c749 only) v ss = 0v v cc = 5v 10% t amb = 21 c to 27 c 12.5 13.0 v i pp program current (87c749 only) v pp = 13.0v 50 ma analog inputs (a/d guaranteed only with quartz window covered.) av cc analog supply voltage 10 av cc = v cc 0.2v 4.5 5.5 v ai cc analog operating supply current av cc = 5.12v 3 9 ma av in analog input voltage av ss 0.2 av cc +0.2 v c ia analog input capacitance 15 pf t ads sampling time 8t cy s t adc conversion time 40t cy s notes on following page.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 13 dc electrical characteristics (continued) t amb = 0 c to +70 c, av cc = 5v 5, av ss = 0v 4 v cc = 5v 10%, v ss = 0v test limits 4 symbol parameter conditions min typ 1 max unit analog inputs (a/d guaranteed only with quartz window covered.) (continued) r resolution 8 bits e ra relative accuracy 1 lsb os e zero scale offset 1 lsb g e full scale gain error 0.4 % m ctc channel to channel matching 1 lsb c t crosstalk 0100khz 60 db notes: 1. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any conditions other than those described in the ac and dc electrical characteri stics section of this specification is not implied. 2. under steady state (non-transient) conditions, i ol must be externally limited as follows: maximum i ol per port pin: 10ma (note: this is 85 c spec.) maximum i ol per 8-bit port: 26ma maximum total i ol for all outputs: 67ma if i ol exceeds the test condition, v ol may exceed the related specification. pins are not guaranteed to sink current greater than the listed test conditions. 3. this product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima. 4. parameters are valid over operating temperature range unless otherwise specified. all voltages are with respect to v ss unless otherwise noted. 5. power-down i cc is measured with all output pins disconnected; port 0 = v cc ; x2, x1 n.c.; rst = v ss . 6. i cc is measured with all output pins disconnected; x1 driven with t clch , t chcl = 5ns, v il = v ss + 0.5v, v ih = v cc 0.5v; x2 n.c.; rst = port 0 = v cc . i cc will be slightly higher if a crystal oscillator is used. 7. idle i cc is measured with all output pins disconnected; x1 driven with t clch , t chcl = 5ns, v il = v ss + 0.5v, v ih = v cc 0.5v; x2 n.c.; port 0 = v cc; rst = v ss . 8. load capacitance for ports = 80pf. 9. the resistor ladder network is not disconnected in the power down or idle modes. thus, to conserve power, the user may remove av cc . 10. if the a/d function is not required, or if the a/d function is only needed periodically, av cc may be removed without affecting the operation of the digital circuitry. contents of adcon and adat are not guaranteed to be valid. if av cc is removed, the a/d inputs must be lowered to less than 0.5v. digital inputs on p1.0p1.4 will not function normally. 11. these parameters do not apply to p1.0p1.4 if the a/d function is enabled. ac electrical characteristics t amb = 0 c to +70 c or 40 c to +85 c, v cc = 5v 10%, v ss = 0v 4, 8 16mhz clock variable clock symbol parameter min max min max unit 1/t clcl oscillator frequency: 3.5 16 mhz external clock (figure 4) t chcx high time 20 20 ns t clcx low time 20 20 ns t clch rise time 20 20 ns t chcl fall time 20 20 ns
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 14 explanation of the ac symbols each timing symbol has five characters. the first character is always `t' (= time). the other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. the designations are: c clock d input data h logic level high l logic level low q output data t time v valid x no longer a valid logic level z float t chcl t clcl t clch t chcx v cc 0.5 0.45v 0.2 v cc + 0.9 0.2 v cc 0.1 t clcx su00297 figure 4. external clock drive 0.2 v cc + 0.9 0.2 v cc 0.1 v cc 0.5 0.45v su00307 figure 5. ac testing input/output 4mhz 8mhz 12mhz 16mhz freq max active i cc 6 typ active i cc 6 max idle i cc 7 typ idle i cc 7 i cc ma 2 4 6 8 10 12 14 16 18 20 22 su00308 figure 6. i cc vs. freq maximum i cc values taken at v cc = 5.5v and worst case temperature. typical i cc values taken at v cc = 5.0v and 25 c. notes 6 and 7 refer to ac electrical characteristics.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 15 programming considerations eprom characteristics the 87c749 is programmed by using a modified quick-pulse programming algorithm similar to that used for devices such as the 87c451 and 87c51. it differs from these devices in that a serial data stream is used to place the 87c749 in the programming mode. figure 7 shows a block diagram of the programming configuration for the 87c749. port pin p0.2 is used as the programming voltage supply input (v pp signal). port pin p0.1 is used as the program (pgm/) signal. this pin is used for the 25 programming pulses. port 3 is used as the address input for the byte to be programmed and accepts both the high and low components of the eleven bit address. multiplexing of these address components is performed using the asel input. the user should drive the asel input high and then drive port 3 with the high order bits of the address. asel should remain high for at least 13 clock cycles. asel may then be driven low which latches the high order bits of the address internally. the high address should remain on port 3 for at least two clock cycles after asel is driven low. port 3 may then be driven with the low byte of the address. the low address will be internally stable 13 clock cycles later. the address will remain stable provided that the low byte placed on port 3 is held stable and asel is kept low. note: asel needs to be pulsed high only to change the high byte of the address. port 1 is used as a bidirectional data bus during programming and verify operations. during programming mode, it accepts the byte to be programmed. during verify mode, it provides the contents of the eprom location specified by the address which has been supplied to port 3. the xtal1 pin is the oscillator input and receives the master system clock. this clock should be between 1.2 and 6mhz. the reset pin is used to accept the serial data stream that places the 87c749 into various programming modes. this pattern consists of a 10-bit code with the lsb sent first. each bit is synchronized to the clock input, x1. programming operation figures 8 and 9 show the timing diagrams for the program/verify cycle. reset should initially be held high for at least two machine cycles. p0.1 (pgm/) and p0.2 (v pp ) will be at v oh as a result of the reset operation. at this point, these pins function as normal quasi-bidirectional i/o ports and the programming equipment may pull these lines low. however, prior to sending the 10-bit code on the reset pin, the programming equipment should drive these pins high (v ih ). the reset pin may now be used as the serial data input for the data stream which places the 87c749 in the programming mode. data bits are sampled during the clock high time and thus should only change during the time that the clock is low. following transmission of the last data bit, the reset pin should be held low. next the address information for the location to be programmed is placed on port 3 and asel is used to perform the address multiplexing, as previously described. at this time, port 1 functions as an output. a high voltage v pp level is then applied to the v pp input (p0.2). (this sets port 1 as an input port). the data to be programmed into the eprom array is then placed on port 1. this is followed by a series of programming pulses applied to the pgm/ pin (p0.1). these pulses are created by driving p0.1 low and then high. this pulse is repeated until a total of 25 programming pulses have occurred. at the conclusion of the last pulse, the pgm/ signal should remain high. the v pp signal may now be driven to the v oh level, placing the 87c749 in the verify mode. (port 1 is now used as an output port). after four machine cycles (48 clock periods), the contents of the addressed location in the eprom array will appear on port 1. the next programming cycle may now be initiated by placing the address information at the inputs of the multiplexed buffers, driving the v pp pin to the v pp voltage level, providing the byte to be programmed to port1 and issuing the 26 programming pulses on the pgm/ pin, bringing v pp back down to the v c level and verifying the byte. programming modes the 87c749 has four programming features incorporated within its eprom array. these include the user eprom for storage of the application's code, a 16-byte encryption key array and two security bits. programming and verification of these four elements are selected by a combination of the serial data stream applied to the reset pin and the voltage levels applied to port pins p0.1 and p0.2. the various combinations are shown in table 3. encryption key table the 87c749 includes a 16-byte eprom array that is programmable by the end user. the contents of this array can then be used to encrypt the program memory contents during a program memory verify operation. when a program memory verify operation is performed, the contents of the program memory location is xnor'ed with one of the bytes in the 16-byte encryption table. the resulting data pattern is then provided to port 1 as the verify data. the encryption mechanism can be disable, in essence, by leaving the bytes in the encryption table in their erased state (ffh) since the xnor product of a bit with a logical one will result in the original bit. the encryption bytes are mapped with the code memory in 16-byte groups. the first byte in code memory will be encrypted with the first byte in the encryption table; the second byte in code memory will be encrypted with the second byte in the encryption table and so forth up to and including the 16the byte. the encryption repeats in 16-byte groups; the 17th byte in the code memory will be encrypted with the first byte in the encryption table, and so forth. security bits two security bits, security bit 1 and security bit 2, are provided to limit access to the user eprom and encryption key arrays. security bit 1 is the program inhibit bit, and once programmed performs the following functions: 1. additional programming of the user eprom is inhibited. 2. additional programming of the encryption key is inhibited. 3. verification of the encryption key is inhibited. 4. verification of the user eprom and the security bit levels may still be performed. (if the encryption key array is being used, this security bit should be programmed by the user to prevent unauthorized parties from reprogramming the encryption key to all logical zero bits. such programming would provide data during a verify cycle that is the logical complement of the user eprom contents). security bit 2, the verify inhibit bit, prevents verification of both the user eprom array and the encryption key arrays. the security bit levels may still be verified.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 16 programming and verifying security bits security bits are programmed employing the same techniques used to program the user eprom and key arrays using serial data streams and logic levels on port pins indicated in table 3. when programming either security bit, it is not necessary to provide address or data information to the 87c749 on ports 1 and 3. verification occurs in a similar manner using the reset serial stream shown in table 3. port 3 is not required to be driven and the results of the verify operation will appear on ports 1.6 and 1.7. ports 1.7 contains the security bit 1 data and is a logical one if programmed and a logical zero if not programmed. likewise, p1.6 contains the security bit 2 data and is a logical one if programmed and a logical zero if not programmed. table 3. implementing program/verify modes operation serial code p0.1 (pgm/) p0.2 (v pp ) program user eprom 296h * v pp verify user eprom 296h v ih v ih program key eprom 292h * v pp verify key eprom 292h v ih v ih program security bit 1 29ah * v pp program security bit 2 298h * v pp verify security bits 29ah v ih v ih note: * pulsed from v ih to v il and returned to v ih . eprom programming and verification t amb = 21 c to +27 c, v cc = 5v 10%, v ss = 0v symbol parameter min max unit 1/t clcl oscillator/clock frequency 1.2 6 mhz t avgl 1 address setup to p0.1 (prog) low 10 m s + 24t clcl t ghax address hold after p0.1 (prog) high 48t clcl t dvgl data setup to p0.1 (prog) low 38t clcl t dvgl data setup to p0.1 (prog) low 38t clcl t ghdx data hold after p0.1 (prog) high 36t clcl t shgl v pp setup to p0.1 (prog) low 10 m s t ghsl v pp hold after p0.1 (prog) 10 m s t glgh p0.1 (prog) width 90 110 m s t avqv 2 v pp low (v cc ) to data valid 48t clcl t ghgl p0.1 (prog) high to p0.1 (prog) low 10 m s t synl p0.0 (sync pulse) low 4t clcl t synh p0.0 (sync pulse) high 8t clcl t masel asel high time 13t clcl t mahld address hold time 2t clcl t haset address setup to asel 13t clcl t adsta low address to address stable 13t clcl notes: 1. address should be valid at least 24t clcl before the rising edge of p0.2 (v pp ). 2. for a pure verify mode, i.e., no program mode in between, t avqv is 14t clcl maximum.
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8-bit a/d, pwm, low pin count 1998 apr 23 17 a0a10 address strobe programming pulses v pp /v ih voltage source clk source reset control logic 87c749 p3.0p3.7 p0.0/asel p0.1 p0.2 xtal1 reset v cc v ss p1.0p1.7 +5v data bus su00309 figure 7. programming configuration min 2 machine cycles ten bit serial code bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 bit 8 bit 9 undefined undefined xtal1 reset p0.2 p0.1 su00302 figure 8. entry into program/verify modes 5v 12.75v 5v 25 pulses t shgl t ghsl t glgh t ghgl 98 m s min 10 m s min t masel t haset t hahld t adsta t dvgl t ghdx t avqv verify mode program mode verify mode p0.2 (v pp ) p0.1 (pgm ) p0.0 (asel) port 3 port 1 invalid data valid data data to be programmed invalid data valid data high address low address su00310 figure 9. program/verify cycle
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8 bit a/d, pwm, low pin count 1998 apr 23 18 dip28: plastic dual in-line package; 28 leads (600 mil); long body sot117-2
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8 bit a/d, pwm, low pin count 1998 apr 23 19 plcc28: plastic leaded chip carrer; 28 leads; pedestal sot261-3
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8 bit a/d, pwm, low pin count 1998 apr 23 20 ssop28: plastic shrink small outline package; 28 leads; body width 5.3mm sot341-1
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8 bit a/d, pwm, low pin count 1998 apr 23 21 notes
philips semiconductors preliminary specification 83c749/87c749 80c51 8-bit microcontroller family 2k/64 otp/rom, 5 channel 8 bit a/d, pwm, low pin count 1998 apr 23 22 definitions short-form specification e the data in a short-form specification is extracted from a full data sheet with the same type number and title. for detailed information see the relevant data sheet or data handbook. limiting values definition e limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the dev ice at these or at any other conditions above those given in the characteristics sections of the specification is not implied. exposure to limi ting values for extended periods may affect device reliability. application information e applications that are described herein for any of these products are for illustrative purposes only. philips semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. disclaimers life support e these products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. philips semiconductors customers using or selling these products for use i n such applications do so at their own risk and agree to fully indemnify philips semiconductors for any damages resulting from such application. right to make changes e philips semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. philips semiconductors ass umes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or m ask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right in fringement, unless otherwise specified. philips semiconductors 811 east arques avenue p.o. box 3409 sunnyvale, california 940883409 telephone 800-234-7381 ? copyright philips electronics north america corporation 1998 all rights reserved. printed in u.s.a. date of release: 05-98 document order number: 9397 750 03856
data sheet status objective specification preliminary specification product specification product status development qualification production definition [1] this data sheet contains the design target or goal specifications for product development. specification may change in any manner without notice. this data sheet contains preliminary data, and supplementary data will be published at a later date. philips semiconductors reserves the right to make chages at any time without notice in order to improve design and supply the best possible product. this data sheet contains final specifications. philips semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. data sheet status [1] please consult the most recently issued datasheet before initiating or completing a design.

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