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HT82K628 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT82K628 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 18 page  HT82K628A Rev. 1.60 4 April 16, 2004 F3H - Set Typematic Rate/Delay The host issues the Set Typematic Rate/Delay com- mand to change the typematic rate and delay. The HT82K628A responds to the command with ACK, stops scanning and waits for the system to issue the rate/de- lay value byte. The HT82K628A responds to the value byte with another ACK, sets the rate and delay to the value indicated, and continues scanning (if it was previ- ously enabled). Bit6 and 5 indicate the delay, and bits 4, 3, 2, 1 and 0 indicate the rate. Bit7 is always 0. The delay is equal to 1 plus the binary value bit 6 and 5, multiplied by 250ms ±20%. The period (interval from one typematic output to the next) is determined by the following equation: Period = (8+A)*(2^B)*0.00417 seconds. Where: A = binary value of bits 2, 1, and 0. B = binary value of bits 4, and 3. The typematic rate is 1 for each period and are listed as follows: Bit Typematic Rate ± 20% Bit Typematic Rate ± 20% 00000 30.0 10000 7.5 00001 26.7 10001 6.7 00010 24.0 10010 6.0 00011 21.8 10011 5.5 00100 20.0 10100 5.0 00101 18.5 10101 4.6 00110 17.1 10110 4.3 00111 16.0 10111 4.0 01000 15.0 11000 3.7 01001 13.3 11001 3.3 01010 12.0 11010 3.0 01011 10.9 11011 2.7 01100 10.0 11100 2.5 01101 9.2 11101 2.3 01110 8.0 11110 2.1 01111 8.0 11111 2.0 The default values for the HT82K628A are as follows: Typematic rate= 10.9 characters per second ± 20% Delay = 500ms ±20% The execution of this command stops without change to the existing rate if another command is received instead of the rate/delay value byte. F4H - Enable Upon receipt of this command, the HT82K628A will re- spond with ACK, clears its output buffer, clears the last typematic key, and starts scanning. F5H - Default Disable The Default Disable command resets all conditions to the power on default states. The HT82K628A will re- spond with ACK, clears its output buffer, sets the default key types (scan code set 3 operation only) and typematic rate/delay, and clears the last typematic key. The HT82K628A then stops scanning and awaits further command. F6H - Set Default The Set Default command resets all conditions to the power on default states. The HT82K628A will respond with ACK, clears its output buffer, sets the default key types (scan code set 3 operation only) and typematic rate/delay, and clears the last typematic key then contin- ues scanning. F7H, F8H, F9H, FAH - Set All Keys These commands instruct the HT82K628A to set all keys to the type listed below: Hex Value Command F7 Set All Keys-Typematic F8 Set All Keys-Make/Break F9 Set All Keys-Make FA Set All Keys-Typematic/Make/Break The HT82K628A will respond with ACK, clears its output buffer, sets all keys to the type indicated by this com- mand, and continues scanning (if it was previously en- abled). Although these commands can be sent using any code set, they affect only scan code set 3 operation. FBH, FCH, FDH - Set Key Type These commands instruct the HT82K628A to set indi- vidual keys to the type listed below: Hex Value Command FB Set Key Type-Typematic FC Set Key Type-Make/Break FD Set Key Type-Make The HT82K628A will respond with ACK, clears its output buffer and prepares to receive key identification. Key identification is accomplished by the host identifying each key by its scan code value as defined in scan code set 3. Only scan code set 3 values are valid for key iden- tification. The type of each identified key is set to the value indicated by the command. Although these com- mands can be sent using any code set, they affect only scan code set 3 operation. |
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