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HT82K28A Win98 Keyboard Encoder
Features
* * * * * *
Designed for Windows 95/98/NT Supports 3 Windows 95 Keys Supports Power, Sleep and Wake-up Windows 98 ACPI functions Supports Japanese, Korean and Portuguese Supports Japanese DOS/V 106-key keyboard Supports code set 1, for PS/2 model 30 keyboard
* * * * * * *
Supports code set 2, for PC/AT, PS/2 model 50,60 keyboards Supports code set 3, for PS/2 model 80 keyboard RC oscillator Phantom key detection Minimal external components Pin-compatible with Holtek HT6547E-2 40-pin DIP/DICE form
General Description
The HT82K28A is a keyboard encoder especially designed for IBM PC/AT, IBM PS/2 and all compatible machines. The HT82K28A accepts keyboard inputs and contains a 16-character first-in-first-out buffer in which data is stored. An inexpensive RC oscillator can be used for the system clock. The device offers the advantage of simple implementation in high performance and low cost keyboard applications.
Pin Assignment
OSC1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VSS VDD VSS IO 0 IO 1 C2 C3 C4 C5 C6 C7 R10 R11 R12 R0 R1 R2 R3 R4 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 C1 C0 DATA CLO CK R18 R17 NC R16 CAP NUM SCRL R9 R8 R15 R14 NC R13 R7 R6 R5
HT82K28A 4 0 D IP
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HT82K28A
Pin Description
Pin No. 1 2, 4 3 5, 6 39, 40, 7~12 16~23, 28, 29, 13~15 24, 26, 27 33, 35 25, 34 30 31 32 37 38 Pin Name OSC1 VSS VDD IO0~IO1 C0~C7 I/O I 3/4 3/4 O I System clock input Negative power supply, ground Positive power supply Customer defined optional output lines Keyboard matrix scanning input pins Description
R0~R18 NC SCRL NUM CAP CLOCK DATA
O 3/4 O O O
Keyboard matrix scanning output pins No connection LED pin LED pin LED pin
I/O Synchronous clock signal. Used to clock the transmission data I/O Bidirectional data transmission line
Absolute Maximum Ratings
Supply Voltage............................4.75V to 5.25V Storage Temperature.................-55C to 125C Input Voltage.................VSS-0.3V to VDD+0.3V Operating Temperature ..................0C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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Electrical Characteristics
Symbol VDD IDD VIL VIH VOL Parameter Operating Voltage Operating Current Input Low Voltage (C0~C7) Input Low Voltage (DATA, CLOCK) Input High Voltage Output Low Voltage (R0~R18) Output Low Voltage (DATA, CLOCK) Internal Pull-high Resistance (C0~C7) Rph fSYS Internal Pull-high Resistance (CLOCK, DATA) System Clock Test Conditions 3/4 3/4 3/4 3/4 3/4 IOL=10mA IOL=15mA 3/4 3/4 3/4 Min. 4.75 3/4 0 0 3.5 3/4 3/4 5 2 3/4 5 2 3/4 3/4 3/4 3/4 3/4 10 5 4 Ta=25C Typ. Max. Unit 5.25 5 0.6 0.6 VDD 0.5 0.5 20 15 3/4 V mA V V V V V kW kW MHz
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Functional Description
The HT82K28A basic function is to detect key press and release activity and to transmit the corresponding scan code, as well as make and break codes to the system. The device also accepts commands from the system and responds to the system if necessary. All communication between the keyboard and the system is managed through the CLOCK and DATA pins. The keyboard begins to scan for pressed or released keys and commands from the system after the BAT (Basic Assurance Test) has been run. Working modes Three working modes are supported by the HT82K28A. These are setup by the alternate scan code command F0. The various modes are described as follows. Mode 1 * Supports code set 1 for PS/2 model 30 keyboards. * Enters mode1 after an F0 Command is issued followed by a 1". * Contains an 11 bit data stream, including one start bit (always zero) eight data bits, one parity bit (odd parity) and one stop bit (always one). * All keys are typematic/make/break as default. * The working mode can be changed again in this mode, by issuing an F0 command followed by an option. See the F0 command for more detail. Mode 2
* Supports code set 2 for PC/AT, PS/2 model 50,
Mode 3
* Supports code set 3, for PS/2 model 80 key-
boards.
* Enters mode 3 when an F0 command is issued
followed by a 3".
* Contains an 11 bit data stream, including one
start bit (always zero) eight data bits, one parity bit (odd parity) and one stop bit (always one).
Buffers The buffers support the following functions:
* 16-byte FIFO buffer: stores 16 keystrokes
scan codes.
* Additional keystrokes will be ignored. * Response codes, i.e FA/FE... do not occupy
buffer positions.
Basic assurance test - BAT The following functions are offered by the Basic Assurance Test:
* Turns on LED status indicators. * Keyboard processor test. * RAM test. * Turns off LED status indicators, i.e. the
LEDs.
* Reports the BAT result to the system.
60 keyboards.
* Enters mode 2 after power on.
The working mode can be changed by an F0 command followed by an option byte 1, 2 or 3. See the F0 command for more details. * Contains an 11 bit data stream, including one start bit (always zero) eight data bits, one parity bit (odd parity) and one stop bit (always one) * All keys are typematic/make/break as default.
Note: During the BAT, activity on the "clock" and "data" line are ignored. The LEDs are turned on at the beginning and turned off at the end of the BAT. The BAT takes a minimum of 450ms after POR and a maximum of 2.5s. The response to a satisfactory BAT completion is AA and response to BAT failure is an FC error. The reset keyboard command FF will also cause the keyboard to execute the BAT. Completion codes are sent between 300 and 500ms after a reset command is acknowledged. After the BAT, the keyboard sets the keys to typematic and make/break, and sets the default typematic rate and delay.
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Power-on Two important activities take place when power is first applied to the keyboard. The first is the presence of an H/W signal POR (Power-On-Reset) that resets the keyboard processor. The second activity is the running of the self test BAT (Basic Assurance Test) routine.
POR 150m s~2s R eset 300m s~500m s
All keys except PAUSE are typematic. Typematic means that the KB keeps sending make codes if the key is held down. The data report is according to the typematic rate/delay: Default values are: delay 500ms 20% 10.9 char/sec 20% The typematic rate and delay can be modified with the F3 command. If two or more keys are held down, only the last key pressed repeats at the typematic rate. Typematic operation stops when the last key pressed is released even if other keys are still held down. If a key is pressed and held down while keyboard transmission is inhibited, only the first make code is stored in the buffer overflow as a result of typematic action. Four key types are supported as shown: Key type Typematic Make/break Make Typematic/ make/break press make1 make1 make1 make1 hold make2 X X make2 release X break X break
4 5 0 m s ~ 2 .5 s e c P o w e r o n s ta rt B A T s ta rte d B A T c o m p le te
PC-type/mode/code set The following table describes the relationship between different computer types, the working mode and the code sets. PS/2 30 PC-AT PS/2 50 PS/2 60 PS/2 80 mode 1 mode 2 mode 2 mode 2 mode 3 code set 1 code set 2 code set 2 code set 2 code set 3
The mode can be changed between mode 2 & 3. Keys
* For code set 1, 2
All keys except the PAUSE key have a make and break code. The PAUSE key has a make code only. The defaults except for PAUSE are make/ break/typematic. In mode 1, 2 and 3 the key type may be changed to be one of the following:
m ode1

Note: "make1" send out only one make code. "Make2" continue sending out make codes until key is released. "X" nothing sent out.
* For code set 3
Typematic Make/break Make Typematic/make/break Can be configured by command Time interval between phantoms The time interval between two continuous error codes 00/FF sent while phantom detected= 1000ms 20%
m ode2
m ode3
Typematic Make/break Make Typematic/make/break
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System command table Command FF - reset FE - resend FD - set key type make FC - set key type make/break FB - set key type typematic FA - set all keys typematic/make/break F9 - set all keys make F8 - set all keys make/break F7 - set all keys typematic F6 - set default F5 - default disabled F4 - enable F3 - set typematic rate/delay F2 - Read ID F1 F0 - select alternate scan codes EF EE - Echo ED - set/reset status indicators The keyboard should respond within 20ms, except when performing the BAT or executing a reset command. Command description
* Default disable - F5
mode 1 y y y y y y y y y y y y y y x y x y y
* Enable - F4
mode 2 y y y y y y y y y y y y y y x y x y y
mode 3 y y y y y y y y y y y y y y x y x y y
Send an ACK to the system Clear output buffer Clear the last typematic key Start scanning

Send an acknowledge FA to the system Clear its output buffer, FIFO Set the default key types Set typematic rate/delay as default value Clear the last typematic key Stop scanning and wait for further instruction
* Invalid command

Send an FE to the system No further activities Note: No ACK
* Read ID - F2
* Echo - EE

Send an EE to the system Continue scanning if the keyboard is enabled Note: This command does not need to feed back the ACK
Send an ACK to the system Discontinue scanning 2 byte ID-AB, 83 The 2nd byte must follow the completion of the first byte within 500ms Resume scanning

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* Resend - FE
Send the last code to the system Note: * No FA response
* Reset - FF
Disable keyboard Send an ACK to the system, the keyboard acknowledges the command with an ACK and ensures the system accepts the ACK before executing the command The system sets CLK=DATA=high for 500ms: acceptance of ACK The system can issue any command to the KB within the 500ms period mentioned above to override FF If no override, the system performs its BAT and enters mode 2 (even if it is set to be mode 3)

FD : Set key type - Make The keyboard responds with ACK, clears its output buffer and prepares to receive key identification Key identification is accomplished by the system identifying each key by its scan code value as defined in scan code set3. Only scan code set3 values are valid for key identification The type of each identified key is set to the value indicated by the command These commands can be sent using any scan code set, but affect only the operation of scan code set3

* Set LED - ED
* Select alternate scan code - F0
Send an ACK to the system Clears both output buffer and the typematic key Accept option byte

* Set all keys - F7, F8, F9, FA
FA: Set all keys to typematic/make/break F9: Set all keys to make F8: Set all keys to make/break F7: Set all keys to typematic Send an ACK to the system Clear output buffer Set all keys to the type indicated by the command

Send ACK to the system Discontinue scanning Wait for the option from the system Respond with ACK to the system Set indicator If command comes from the system in place of option, discard the set LED function and then process the new command LED default after power on - all off Set default disable - do not change the LEDs

* Set typematic rate/delay - F3
* Set default - F6
Send an ACK to the system Clear the output buffer Set to default key states: Default key type typematic rate/delay

* Set key type - FB,FC,FD

FB : Set key type - Typematic FC : Set key type - Make/Break
Send an ACK to the system Stop scanning Wait for the system typematic rate and delay Send an ACK to the system Set rate/delay Bit 6,5 delay Bit 4,3,2,1,0 typematic rate Bit 7=0 (always) Delay= (1+bit6,bit5) 250ms Typematic rate= 1/period ...where period= (8+A) (2^B) 0.00417 ...where A= binary value of bit 2, 1 and 0 ...where B= binary value of bit 4 and 3

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b4~b0 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111
* Default

Typematic rate 30.0 26.7 24.0 21.8 20.0 18.5 17.1 16.0 15.0 13.3 12.0 10.9 10.0 9.2 8.6 8.0
b4~b0 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111
Typematic rate 7.5 6.7 6.0 5.5 5.0 4.6 4.3 4.0 3.7 3.3 3.0 2.7 2.5 2.3 2.1 2.0
* FE: Resend
The KB issues an FE when there is a parity error in transmission.
Data communications
* Data output
If CLK=0, no transmission (keyboard inhibited). If CLK=1, DATA=0, no transmission (system request to send). If CLK=1, DATA=1, transmission permitted. Data will be valid before the trailing edge and beyond the leading edge of the clock. The KB checks the clock line for an active level at least every 60ms. If line contention occurs (system brings the clock low before the tenth clock), set clock=data=high.
delay: 500ms 20% typematic rate=10.9 characters/sec 20%
* Data input
Commands to the system 00: keyboard detect a error/overrun (set 2, set 3) AB,83: keyboard ID AA: BAT completion FC: BAT failure EE: Echo FA: Acknowledge FE: Resend FF: Keyboard detects a overrun (set 1)
* FA: Acknowledge
If the KB (Keyboard) receives any valid input except EE (echo) and resend (FE) then send an FA to the system first. If the command is EE, then send an EE back to the system. If the command is FE, then send the last key code to system. If there is an interrupt while sending FA, the KB discards the FA and accepts the command from the system and processes it. * 00/FF: Key overrun If the keyboard detects an overrun error, the KB sends an overrun error code to the system. mode 1: FF mode 2,3: 00
8
The system overrides the clock line for at least 60ms The keyboard checks the state of the clock line at intervals of no more than 10ms If a system request-to-send is detected, the keyboard counts 11 data bits. Data will be valid before the rising edge and beyond the falling edge After the 10th bit, the keyboard checks for an active level on the "data" line. If the line is active it is forced to be inactive, and counts one more bit. Note: This action signals the system that the keyboard has received its data. Upon reception of this signal, the system returns to the ready state, in which it can accept keyboard outputs or goes to the inhibit state until it is ready.
If the keyboard "data" line is found to be at an inactive level following the 10th bit, a frame error has occurred, and the keyboard continues to count until the "data" line becomes active. The keyboard then makes the "data" line inactive and sends a Resend.
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Data stream Mode 1,2,3 B1: B2: b3: b4: b5: B6 b7: b8: b9: b10: b11: start bit always 0 data bit 0 data bit 1 data bit 2 data bit 3 data bit 4 data bit 5 data bit 6 data bit 7 parity bit (odd par) stop bit always 1
Note: The parity bit is either 1 or 0, and the 8 data bits, plus the parity bit, always have an odd number of 1 s.
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Key code set 1 Key Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 Make/Break Code 29 / A9 02 / 82 03 / 83 04 / 84 05 / 85 06 / 86 07 / 87 08 / 88 09 / 89 0A / 8A 0B / 8B 0C / 8C 0D / 8D 7D / FD 0E / 8E 0F / 8F 10 / 90 11 / 91 12 / 92 13 / 93 14 / 94 15 / 95 16 / 96 17 / 97 18 / 98 19 / 99 1A / 9A 1B / 9B 2B / AB 3A / BA 1E / 9E 1F / 9F 20 / A0 21 / A1 22 / A2 23 / A3 24 / A4 25 / A5 26 / A6 27 / A7 28 / A8 2B / AB 1C / 9C 2A / AA 56 / D6 2C / AC 2D / AD 2E / AE 2F / AF Key Number 50 51 52 53 54 55 56 57 58 60 61 62 64 90 91 92 93 96 97 98 99 100 101 102 103 104 105 106 107 108 110 112 113 114 115 116 117 118 119 120 121 122 123 125 131 132 133 Make/Break Code 30 / B0 31 / B1 32 / B2 33 / B3 34 / B4 35 / B5 73 / F3 36 / B6 1D / 9D 38 / B8 39 / B9 E0 38 / E0 B8 E0 1D / E0 9D 45 / C5 47 / C7 4B / CB 4F / CF 48 / C8 4C / CC 50 / D0 52 / D2 37 / B7 49 / C9 4D / CD 51 / D1 53 / D3 4A / CA 4E / CE 7E / FE E0 1C / E0 9C 01 / 81 3B / BB 3C / BC 3D / BD 3E / BE 3F / BF 40 / C0 41 / C1 42 / C2 43 / C3 44 / C4 57 / D7 58 / D8 46 / C6 7B / FB 79 / F9 70 / F0
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Key code set 1 Base Case Left-Shift Right-Shift Shift+Num E0 B6 E0 52 E0 AA E0 52 E0 52 75 /E0 D2 E0 36 /E0 D2 E0 2A /E0 D2 E0 B6 E0 53 E0 AA E0 53 E0 53 76 /E0 D3 E0 36 /E0 D3 E0 2A /E0 D3 E0 B6 E0 4B E0 AA E0 4B E0 4B 79 /E0 CB E0 36 /E0 CB E0 2A /E0 CB E0 B6 E0 47 E0 AA E0 47 E0 47 80 /E0 C7 E0 36 /E0 C7 E0 2A /E0 C7 E0 B6 E0 4F E0 AA E0 4F E0 4F 81 /E0 CF E0 36 /E0 CF E0 2A /E0 CF E0 B6 E0 48 E0 AA E0 48 E0 48 83 /E0 C8 E0 36 /E0 C8 E0 2A /E0 C8 E0 B6 E0 50 E0 AA E0 50 E0 50 84 /E0 D0 E0 36 /E0 D0 E0 2A /E0 D0 E0 B6 E0 49 E0 AA E0 49 E0 49 85 /E0 C9 E0 36 /E0 C9 E0 2A /E0 C9 E0 B6 E0 51 E0 AA E0 51 E0 51 86 /E0 D1 E0 36 /E0 D1 E0 2A /E0 D1 E0 B6 E0 4D E0 AA E0 4D E0 4D 89 /E0 CD E0 36 /E0 CD E0 2A /E0 CD E0 5B E0 AA E0 5B E0 B6 E0 5B L Win /E0 DB /E0 DB E0 2A /E0 DB E0 36 E0 5C E0 AA E0 5C E0 B6 E0 5C R Win /E0 DC /E0 DC E0 2A /E0 DC E0 36 E0 5D E0 AA E0 5D E0 B6 E0 5D APP /E0 DD /E0 DD E0 2A /E0 DD E0 36 When both shift keys are held down: Both Shift key number 75 E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36 Key Number Key Number 95 Base E0 35 /E0 B5 +Left-Shift E0 AA E0 35 /E0 B5 E0 2A Both Shift E0 AA E0 B6 E0 35 /E0 B5 E0 2A E0 36 +Left-Shift E0 37 /E0 B7 Num Lock E0 2A E0 52 /E0 D2 E0 AA E0 2A E0 53 /E0 D3 E0 AA E0 2A E0 4B /E0 CB E0 AA E0 2A E0 47 /E0 C7 E0 AA E0 2A E0 4F E0 CF E0 AA E0 2A E0 48 E0 C8 E0 AA E0 2A E0 50 /E0 D0 E0 AA E0 2A E0 49 /E0 C9 E0 AA E0 2A E0 51 E0 D1 E0 AA E0 2A E0 4D E0 CD E0 AA E0 2A E0 5B /E0 DB E0 AA E0 2A E0 5C /E0 DC E0 AA E0 2A E0 5D /E0 DD E0 AA
+Right-Shift E0 B6 E0 35 /E0 B5 E0 36
when both shift keys are held down: key number 95 Key Number 124 Base E0 2A E0 37 /E0 B7 E0 AA
+Right-Shift 54/D4
Key Number Base +Ctrl 126 E1 1D 45 E1 9D C5 E0 46 E0 C6 This key is not typematic, all associated scan codes occur on the make code. ACPI Key Power Sleep Wake Make E0 5E E0 5F E0 63
11
Break E0 DE E0 DF E0 E3
Windows Virtual Key N/A N/A N/A
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HT82K28A
Key code set 2 Key Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 Make/Break Code 0E / F0 0E 16 / F0 16 1E / F0 1E 26 / F0 26 25 / F0 25 2E / F0 2E 36 / F0 36 3D / F0 3D 3E / F0 3E 46 / F0 46 45 / F0 45 4E / F0 4E 55 / F0 55 6A / F0 6A 66 / F0 66 0D / F0 0D 15 / F0 15 1D / F0 1D 24 / F0 24 2D / F0 2D 2C / F0 2C 35 / F0 35 3C / F0 3C 43 / F0 43 44 / F0 44 4D / F0 4D 54 / F0 54 5B / F0 5B 5D / F0 5D 58 / F0 58 1C / F0 1C 1B / F0 1B 23 / F0 23 2B / F0 2B 34 / F0 34 33 / F0 33 3B / F0 3B 42 / F0 42 4B / F0 4B 4C / F0 4C 52 / F0 52 5D / F0 5D 5A / F0 5A 12 / F0 12 61 / F0 61 1A / F0 1A 22 / F0 22 21 / F0 21 2A / F0 2A Key Number 50 51 52 53 54 55 56 57 58 60 61 62 64 90 91 92 93 96 97 98 99 100 101 102 103 104 105 106 107 108 110 112 113 114 115 116 117 118 119 120 121 122 123 125 131 132 133 Make/Break Code 32 / F0 32 31 / F0 31 3A / F0 3A 41 / F0 41 49 / F0 49 4A / F0 4A 51 / F0 51 59 / F0 59 14 / F0 14 11 / F0 11 29 / F0 29 E0 11 / E0 F0 11 E0 14 / E0 F0 14 77 / F0 77 6C / F0 6C 6B / F0 6B 69 / F0 69 75 / F0 75 73 / F0 73 72 / F0 72 70 / F0 70 7C / F0 7C 7D / F0 7D 74 / F0 74 7A / F0 7A 71 / F0 71 7B / F0 7B 79 / F0 79 6D / F0 6D E0 5A / E0 F0 5A 76 / F0 76 05 / F0 05 06 / F0 06 04 / F0 04 0C / F0 0C 03 / F0 03 0B / F0 0B 83 / F0 83 0A / F0 0A 01 / F0 01 09 / F0 09 78 / F0 78 07 / F0 07 7E / F0 7E 67 / F0 67 64 / F0 64 13 / F0 13
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Key code set 2 Key Number 75 76 79 80 81 83 84 85 86 89 L Win R Win APP Base Case Shift+Num E0 70 /E0 F0 72 E0 71 /E0 F0 71 E0 6B /E0 F0 6B E0 6C /E0 F0 6C E0 69 /E0 F0 69 E0 75 /E0 F0 75 E0 72 /E0 F0 72 E0 7D /E0 F0 7D E0 7A /E0 F0 7A E0 74 /E0 F0 74 E0 1F /E0 F0 1F E0 27 /E0 F0 27 E0 2F /E0 F0 2F Left-Shift E0 F0 12 E0 70 /E0 F0 70 E0 12 E0 F0 12 E0 70 /E0 F0 71 E0 12 E0 F0 12 E0 70 /E0 F0 6B E0 12 E0 F0 12 E0 70 /E0 F0 6C E0 12 E0 F0 12 E0 70 /E0 F0 69 E0 12 E0 F0 12 E0 70 /E0 F0 75 E0 12 E0 F0 12 E0 70 /E0 F0 72 E0 12 E0 F0 12 E0 70 /E0 F0 7D E0 12 E0 F0 12 E0 70 /E0 F0 7A E0 12 E0 F0 12 E0 70 /E0 F0 74 E0 12 E0 F0 12 1F /E0 F0 1F E0 12 E0 F0 12 27 /E0 F0 27 E0 12 E0 F0 12 2F /E0 F0 2F E0 12 Right-Shift Num Lock
When both shift keys are held down: key number 75 Key Number 95 Base E0 4A /E0 F0 4A
E0 12 E0 70 E0 F0 59 E0 70 /E0 F0 70 E0 F0 12 /E0 F0 70 E0 59 E0 12 E0 71 E0 F0 59 E0 71 /E0 F0 71 E0 F0 12 /E0 F0 71 E0 59 E0 12 E0 6B E0 F0 59 E0 6B /E0 F0 6B E0 F0 12 /E0 F0 6B E0 59 E0 12 E0 6C E0 F0 59 E0 6C /E0 F0 6C E0 F0 12 /E0 F0 6C E0 59 E0 12 E0 69 E0 F0 59 E0 69 /E0 F0 69 E0 F0 12 /E0 F0 69 E0 59 E0 12 E0 75 E0 F0 59 E0 75 /E0 F0 75 E0 F0 12 /E0 F0 75 E0 59 E0 12 E0 72 E0 F0 59 E0 72 /E0 F0 72 E0 F0 12 /E0 F0 72 E0 59 E0 12 E0 7D E0 F0 59 E0 7D /E0 F0 7D E0 F0 12 /E0 F0 7D E0 59 E0 12 E0 7A E0 F0 59 E0 7A /E0 F0 7A E0 F0 12 /E0 F0 7A E0 59 E0 12 E0 74 E0 F0 59 E0 74 /E0 F0 74 E0 F0 12 /E0 F0 74 E0 59 E0 F0 59 E0 1F E0 12 E0 1F /E0 F0 1F E0 59 /E0 F0 1F E0 F0 12 E0 F0 59 E0 27 E0 59 E0 27 /E0 F0 27 E0 59 /E0 F0 27 E0 F0 12 E0 F0 59 E0 2F E0 59 E0 2F /E0 F0 2F E0 59 /E0 F0 2F E0 F0 59 Both Shift E0 F0 12 E0 F0 59 E0 70 /E0 F0 70 E0 12 E0 59 +Right-Shift E0 F0 59 E0 4A /E0 F0 4A E0 59
When both shift keys are held down: key number 95 Key Number 124 Base E0 12 E0 7C /E0 F0 7C E0 12
+Left-Shift E0 F0 12 E0 4A /E0 F0 4A E0 12 Both Shift E0 F0 12 E0 F0 59 E0 4A /E0 F0 4A E0 12 E0 59 +Shift / +Ctrl E0 7C /E0 F0 7C
+Alt 84 / F0 84
Key Number Base +Ctrl 126 E1 14 77 E1 F0 14 F0 77 E0 7E E0 F0 7E Note: this key is not typematic, all associated scan codes occur on the make of the key. ACPI key Power Sleep Wake Make E0 37 E0 3F E0 5E Break E0 F0 37 E0 F0 3F E0 F0 5E Windows Virtual Key N/A N/A N/A
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February 16, 2000
HT82K28A
Key code set 3 Key # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Make/ Break Code 0E / F0 0E 16 / F0 16 1E / F0 1E 26 / F0 26 25 / F0 25 2E / F0 2E 36 / F0 36 3D / F0 3D 3E / F0 3E 46 / F0 46 45 / F0 45 4E / F0 4E 55 / F0 55 5D / F0 5D 66 / F0 66 0D / F0 0D 15 / F0 15 1D / F0 1D 24 / F0 24 2D / F0 2D 2C / F0 2C 35 / F0 35 3C / F0 3C 43 / F0 43 44 / F0 44 4D / F0 4D 54 / F0 54 5B / F0 5B 5C / F0 5C 14 / F0 14 Note Default Key State Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Make/Break Key # 57 58 60 61 62 64 75 76 79 80 81 83 84 85 86 89 90 91 92 93 95 96 97 98 99 100 101 102 103 104 Make/ Break Code 59 / F0 59 11 / F0 11 19 / F0 19 29 / F0 29 39 / F0 39 58 / E0 58 67 / F0 67 64 / F0 64 61 / F0 61 6E / F0 6E 65 / F0 65 63 / F0 63 60 / F0 60 6F / F0 60 6D / F0 6D 6A / F0 6A 76 / F0 76 6C / F0 6C 6B / F0 6B 69 / F0 69 77 / F0 77 75 / F0 75 73 / F0 73 72 / F0 72 70 / F0 70 7E / F0 7E 7D / F0 7D 74 / F0 74 7A / F0 7A 71 / F0 71 Note * * * * * * * * * * * * * * * Default Key State Make/Break Make/Break Make/Break Typematic Make Only Make Only Make Only Typematic Typematic Make Only Make Only Typematic Typematic Make Only Make Only Typematic Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only
*
*
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February 16, 2000
HT82K28A
Key # 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 Make/ Break Code 1C / F0 1C 1B / F0 1B 23 / F0 23 2B / F0 2B 34 / F0 34 33 / F0 33 3B / F0 3B 42 / F0 42 4B / F0 4B 4C / F0 4C 52 / F0 52 5D / F0 5D 5A / F0 5A 12 / F0 12 13 / F0 13 1A / F0 1A 22 / F0 22 21 / F0 21 2A / F0 2A 32 / F0 32 31 / F0 31 3A / F0 3A 41 / F0 41 49 / F0 49 4A / F0 4A 51/ F0 51 Note Default Key State Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Make/Break Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Typematic Key # 105 106 107 108 110 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 131 132 133 L Win R Win APP Make/ Break Code 84 / F0 84 7C / F0 7C 7B/ F0 7B 79 / F0 79 08 / F0 08 07 / F0 07 0F / F0 0F 17 / F0 17 1F / F0 1F 27 / F0 27 2F / F0 2F 37 / F0 /37 3F / F0 3F 47 / F0 47 4F / F0 4F 56 / F0 56 5E / F0 5E 57 / F0 57 5F / F0 5F 62 / F0 62 85 / F0 85 86 / F0 86 87 / F0 87 8B / F0 8B 8C / F0 8C 8D / F0 8D Note * * * * * * * * * * * * * * * * * * * * * * * * * * Default Key State Make Only Typematic Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make Only Make/Break Make/Break Make/Break
* *
* Different from code set 2
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February 16, 2000
HT82K28A
Timing Diagrams
Data output
(1 ) CLK (3 ) 1st C LK (3 ) 2nd C LK (3 ) (3 ) 1 0 th C LK (4 ) 1 1 th C LK T5 (5 ) (7 )
T3 (2 ) DATA T1 S ta r t B it T2
T4 B it 0 P a r ity B it
S to p B it (6 )
T im in g P a r a m e te r T1 T2 T3 T4 T5 D A T A tr a n s itio n to th e fa llin g e d g e o f C L K R is in g e d g e o f C L K to D A T A tr a n s itio n D u r a tio n o f C L K in a c tiv e D u r a tio n o f C L K a c tiv e T im e to a u x ilia r y d e v ic e in h ib it a fte r c lo c k 1 1 to e n s u r e th e a u x ilia r y d e v ic e d o e s n o t s ta r t a n o th e r tr a n s m is s io n
M in /M a x 5 /2 5 m s e c 5 /T 4 -5 m s e c 3 0 /5 0 m s e c 3 0 /5 0 m s e c > 0 /5 0 m s e c
Keyboard data input
(1 ) CLK (2 ) I/O In h ib it (4 ) 1st C LK 2nd C LK 9 th C LK 1 0 th C LK 1 1 th C LK (8 ) (6 ) P a r ity B it (5 ) S to p B it (7 )
T7 T9 DATA S ta r t B it (3 )
T8 B it 0 (5 )
T im in g P a r a m e te r T7 T8 T9 D u r a tio n o f C L K in a c tiv e D u r a tio n o f C L K a c tiv e T im e fr o m in a c tiv e to a c tiv e C L K tr a n s itio n , u s e d to tim e w h e n th e a u x ilia r y d e v ic e s a m p le s D A T A
M in /M a x 3 0 /5 0 m s e c 3 0 /5 0 m s e c 5 /2 5 m s e c
16
February 16, 2000
HT82K28A
Application Circuits
VDD
3 4
VDD VSS OSC1
C7 C6 C5 C3 C2 C1 C0 R17 R16 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 C4
F .B . 0 .1 m F 10mF R
1 2 38
GND
VSS
12 11 10 9 8 7 40 39 33 27 26 24 15 14 13 29 28 23 22 21 20 19 18 17 16 35
DATA
CLO CK
DATA
CLO CK V
DD
37
5
IO 0
CAP
32 31
30
NUM
SCRL
LED LED LED
CAP NUM SCRL
25
34
NC NC NC IO 1
36
6
H T82K 28A
17
February 16, 2000
HT82K28A
Standard Holtek Win98 keyboard C7 R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 K129 K109 R-WIN F5 ! 1 @ 2 # 3 $ 4 & 7 * 8 ( 9 ) 0 PRINT F10 POWER SLEEP PG DN END F9 DEL INSERT PG UP HOME C6 ~ F1 F2 % 5 ^ 6 + = F8 _ C5 C4 C3 SLEEP ESC K45 F4 G H F6 A S D F J K L " ' L-ALT ENTER NUM LOCK NUM / NUM * F11 SPACE NUM 0 NUM . UP Arrow | \ NUM 1 NUM 2 NUM 3 NUM ENTER R-SHF BS NUM 4 NUM 5 NUM 6 K107 L-SHF L-WIN : ; C2 C1 POWER TAB CAP LOCK F3 T Y } ] F7 { [ C0 PAUSE Q W E R U I O P SCR LOCK K14 NUM 7 NUM 8 NUM 9 NUM + WAKE UP K130
L-CTRL WAKE-UP R-CTRL K131 K132 K133 B N K56 APP ? / R-ALT F12 DOWN Arrow RIGHT Arrow NUM LEFT Arrow K94 Z X C V M < , > . K42
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February 16, 2000
HT82K28A
The above key code is according to the Microsoft specification except for the following keys. Key No 14 94 109 129 130 Code Set 1 Make/Break 7D 7C 78 F1 F0 FD FC F8 Code Set 2 Make/Break 6A 68 63 F1 F2 F0 6A F0 68 F0 63 Code Set 3 Make/Break 5D 68 78 F1 F2 F0 5D F0 68 F0 78
19
February 16, 2000
HT82K28A
Holtek Semiconductor Inc. (Headquarters) No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Taipei Office) 5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C. Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Hong Kong) Ltd. RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Copyright O 2000 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
20
February 16, 2000

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