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HT82K28 数据表(PDF) 7 Page - Holtek Semiconductor Inc |
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HT82K28 数据表(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 20 page  HT82K28A 7 February 16, 2000 · 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 be- fore 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) · 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 com- mand · 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 ¨ 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 ¨ 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 ¨ Send an ACK to the system ¨ Stop scanning ¨ Wait for the system typematic rate and de- lay ¨ 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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