Datasheet

Section 18 Keyboard Buffer Control Unit (PS2)
Rev. 3.00 Sep. 28, 2009 Page 572 of 910
REJ09B0350-0300
18.3.5 Keyboard Data Buffer Register (KBBR)
KBBR stores receive data. Its value is valid only when KBF = 1.
Bit Bit Name
Initial
Value R/W Description
7
6
5
4
3
2
1
0
KB7
KB6
KB5
KB4
KB3
KB2
KB1
KB0
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
Keyboard Data 7 to 0
8-bit read only data.
Initialized to H'00 by a reset or when KBIOE is cleared
to 0.
18.3.6 Keyboard Buffer Transmit Data Register (KBTR)
KBTR stores transmit data.
Bit Bit Name
Initial
Value R/W Description
7
6
5
4
3
2
1
0
KBT7
KBT6
KBT5
KBT4
KBT3
KBT2
KBT1
KBT0
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Keyboard Buffer Transmit Data Register 7 to 0
Initialized to H'FF at reset.