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EM83055H Datasheet(PDF) 7 Page - ELAN Microelectronics Corp |
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EM83055H Datasheet(HTML) 7 Page - ELAN Microelectronics Corp |
7 / 22 page 7 * This specification are subject to be changed without notice. EM83055H KEYBOARD ENCODER 9.25.2001 Keyboards ID ( Hex 83AB ) The 2 byte ID is issued to respond to READ ID command. The low byte is sent first, followed by the high byte. Keyboard buffer Overrun ( Hex 00 or FF ) If keyboard buffer overflows, the overrun code will replace the last byte in the buffer. If the keyboard is using scan code set 1 , the code is hex FF. For sets 2 and 3, the code is hex 00. Resend ( Hex FE ) When the keyboard receives an invalid input or any input with incorrect parity, the RESEND command is sent. Keyboard Scan Code Table The keyboard contains 3 scan code sets. The system defaults to scan code set 2, but can be switched to set 1 or set 3 . The following tables show the key numbers and three scan code sets in hexadecimal values. All the keys are typematics except for the pause key. When a key is pressed down, the make scan code is sent to the system. When the key is released, its break code is sent. If two or more keys are held down, only the last key pressed repeats at the typematic rate. Typematic operation stops when the last pressed key is released, even if other keys are being released or some other keys are still held down. The following table shows three scan code sets used in the keyboard. scan code set 1 Key Make code Break code Key Make code Break code `(~) 29 A9 X 2D AD 102 82 C 2E AE 203 83 V 2F AF 304 84 B 30 B0 405 85 N 31 B1 506 86M 32 B2 6 07 87 ,(<) 33 B3 7 08 88 .(>) 34 B4 8 09 89 /(?) 35 B5 9 0A 8A SHIFT_R 36 B6 0 0B 8B CTRL_L 1D 9D -(-) 0C 8C ALT_L 38 B8 =(+) 0D 8D SPACE 39 B9 BACK SPACE 0E 8E ALT_R E0 38 E0 B8 TAB 0F 8F CTRL_R E0 1D E0 9D Q 10 90 NUM 45 C5 W11 91 (7) 47 C7 E 1292 (4) 4B CB R13 93 (1) 4F CF T 1494 (8) 48 C8 Y15 95 (5) 4C CC |
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