HD64F2149 Datasheet, PDF (907/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

KBCRL0—Keyboard Control Register L0
KBCRL1—Keyboard Control Register L1
KBCRL2—Keyboard Control Register L2
Bit
Initial value
Read/Write
7
KBE
0
R/W
6
KCLKO
1
R/W
5
KDO
1
R/W
H'FED9
H'FEDD
H'FEE1
Keyboard Buffer Controller
Keyboard Buffer Controller
Keyboard Buffer Controller
4
3
2
1
0
— RXCR3 RXCR2 RXCR1 RXCR0
1
0
0
0
0
—
R
R
R
R
Receive counter
RXCR3 RXCR2 RXCR1 RXCR0 Receive data contents
0
0
0
0
—
1
Start bit
1
0
KB0
1
KB1
1
0
0
KB2
1
KB3
1
0
KB4
1
KB5
1
0
0
0
KB6
1
KB7
1
0
1
Parity bit
—
1
—
—
—
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
873