Datasheet

Appendix B Internal I/O Registers
Rev. 4.00 Sep 27, 2006 page 1011 of 1130
REJ09B0327-0400
KBCRL0—Keyboard Control Register L0 H'FED9 Keyboard Buffer Controller
KBCRL1—Keyboard Control Register L1 H'FEDD Keyboard Buffer Controller
KBCRL2—Keyboard Control Register L2 H'FEE1 Keyboard Buffer Controller
KBE
RXCR2 RXCR1 RXCR0KCLKO KDO — RXCR3
Bit
Initial value
Read/Write
76543210
0
1110000
R/W R R RR/W R/W — R
Receive counter
RXCR2 RXCR1
0
1
0
1
0
1
0
1
0
1
—
RXCR0
0
1
0
1
0
1
0
1
0
1
0
1
—
RXCR3
0
1
Receive data contents
—
Start bit
KB0
KB1
KB2
KB3
KB4
KB5
KB6
KB7
Parity bit
—
—
Keyboard data out
0
Keyboard buffer controller data I/O pin is low
1 Keyboard buffer controller data I/O pin is high
Keyboard clock out
0
Keyboard buffer controller clock I/O pin is low
1 Keyboard buffer controller clock I/O pin is high
Keyboard enable
0
Loading of receive data into KBBR is disabled
1 Loading of receive data into KBBR is enabled