seiko instruments inc. 1 the S-7292AF is a cmos 4-bit microcomputer for telephone sets, which integrates rom, ram, timers, a serial i/o, i/o ports and a dialer circuit on one chip. it features low voltage operation and low current consumption. at power failure, it is powered solely by telephone line input. it is usable for wireless telephone set and multi-function telphone set. n applications standard telephone set, wireless telephone set, answering machine personal facsimile 1-chip microcomputer for telephone set S-7292AF n features characteristics power supply voltage: 1.7 to 5.5 v (pulse mode, a crystal used) 2.0 to 5.5 v (dtmf mode) current consumption: running: 0.20 ma typ. in pulse mode, 2.4v operation 0.35 ma typ. in dtmf mode, 2.4v operation standby: 2.5 ma max., 2.4v operation instruction execution time : 17.9 ms (operating frequency : 224khz) hardware functions rom : 3k16 bits ram : 7684 bits i/o line : 33 [10 inputs, 12 outputs, 11 i/o (including key interface)] serial i/o : 1 ch (8-bit clock syncronization) timer : timer 1 (8-bit general-purpose timer with reload function) timer 2 (8-bit dial pulse timer) interval timer (selectable from 150 / 300hz) watchdog timer 4 pins for telephone use : hs (hs), beep, kt, tone-out interrupt function: internal (three), external (four) oscillation circuit : crystal or ceramic oscillator (3.579545mhz) software instruction: 35 basic instruction sets (166 when addressing modes are included) 16-level subroutine nesting package 44-pin qfp otp version s-72p92af (its electrical characteristics differ from those of S-7292AF) rev.1.1 discontinued product
1-chip microcomputer for telephone set S-7292AF 2 seiko instruments inc. n n pin assignments ( ) : mask option *nc is v pp for s-72p92af discontinued product
1-chip microcomputer for telephone set S-7292AF seiko instruments inc. 3 n n terminal functions n block diagram the S-7292AF blocks connect with a 4-bit data bus(db), 4-bit address bus(ab), 4-bit ram address bus(ra) and 12-bit operation bus(ob). pin name i/o functions v ss ? common potential terminal v dd ? positive power supply test input test, usually connected to v dd (built-in pull-up resistor) ac input reset (built-in pull-up resistor, schmitt trigger input) x in x out input output crystal/ceramic oscillator connection terminal for system clock oscillation or dtmf signal generation hs input hook switch input beep output buzzer output tone-out output dtmf signal output (pch open-drain output) kt output key-in-tone output r 0 to r 5 input row signal input (built-in pull-up resistor) c 1 to c 4 output column signal output (see the description of po 4 to po 7 for c 5 to c 8 ) pi 0 to pi 3 input 4-bit input port (port 0). pi 0 is shared with the following function: pi 0 /inta : external interrupt (schmitt trigger input) po 0 to po 3 output 4-bit output port (port 1). po 3 is shared with the following function: po 3 /dp(po 3 /dp) : dial pulse output po 4 to po 7 output 4-bit output port (port 5). po 4 to po 7 are shared with column signal outputs as follows: po 4 /c 5 , po 5 /c 6 , po 6 /c 7 , po 7 /c 8 pio 0 to pio 3 i/o 4-bit input/output port (port 3), selectable in bit unit. pio 4 to pio 6 i/o 3-bit input/output port (port 4), selectable in bit unit. pio 4 to pio 6 are shared with column signal outputs as follows (pio 4 and pio 6 are schmitt trigger input): pio 4 /sck: serial clock input/output pio 5 /so : serial data output pio 6 /si : serial data input pio 8 to pio 11 i/o 4-bit input/output port (port 2), selectable in bit unit. nc ? v pp terminal for s-72p92af inta itm (150/300 hz) sysclk dp(dp) inta hs tone-out rom flag a ccb page register ram stack stack pointer acca al u v dd v ss db ob ab program counter ra ac dtmf generator system clock generation circuit x out x in port 0 buffer instruction decoder interrupt vector table interrupt control timer 1 pio 4 /sck pio 5 /so pio 6 /si port 4 buffer test key input pi 0 to pi 3 dp generator port 1 buffer po 0 to po 3 port 2 buffer pio 8 to pio 11 port 3 buffer pio 0 to pio 3 serial interface buzzer driving circuit kt beep key interface c 1 to c 8 r 0 to r 5 port 5 buffer po 4 to po 7 watchdog timer hook switch interface hs 74 hz 2071 hz timer 2 74 hz 2071 hz dp discontinued product
qp044-a 990531 0.350.1 0.8 0.15 12.40.4 10.0 1 11 12 22 23 33 34 44 0.15 +0.1 -0.05 44-pin qfp unit:mm dimensions discontinued product
the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. discontinued product
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