eKK6111
RF Keyboard Decorder
6.7.5 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.
6.7.6 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.
6.7.7 Resend ( Hex FE )
When the keyboard receives an invalid input or any input with incorrect parity, the
RESEND command is sent.
7 Keyboard Scan Code Table
The keyboard contains 3 scan code sets. The system defaults to scan 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.
7.1 Scan Code Set 1
Key
Make code
Break code
Key
X
Make code
Break code
‘(~)
29
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
A9
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
2D
2E
2F
AD
AE
AF
1
C
2
V
3
B
30
B0
4
N
31
B1
5
M
32
B2
6
, (<)
. (>)
/ (?)
33
B3
7
34
B4
8
35
B5
9
0
SHIFT_R
CTRL_L
ALT_L
SPACE
ALT_R
36
B6
1D
38
9D
- (_)
B8
= (+)
39
B9
Back Space
E0 38
E0 B8
8 •
Product Specification (V1.0) 11.15.2002
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
