HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 507

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

17.3
The keyboard buffer controller has the following registers for each channel.
17.3.1
KBCRH indicates the operating status of the keyboard buffer controller.
Bit
7
6
5
4
Keyboard control register H (KBCRH)
Keyboard control register L (KBCRL)
Keyboard data buffer register (KBBR)
Bit Name
KBIOE
KCLKI
KDI
KBFSEL
Register Descriptions
Keyboard Control Register H (KBCRH)
Initial Value
0
1
1
1
R/W
R/W
R/W
R/W
R/W
Description
Keyboard In/Out Enable
Selects whether or not the keyboard buffer controller
is used.
0: The keyboard buffer controller is non-operational
1: The keyboard buffer controller is enabled for
Keyboard Clock In
Monitors the KCLK I/O pin. This bit cannot be
modified.
0: KCLK I/O pin is low
1: KCLK I/O pin is high
Keyboard Data In:
Monitors the KDI I/O pin. This bit cannot be modified.
0: KD I/O pin is low
1: KD I/O pin is high
Keyboard Buffer Register Full Select
Selects whether the KBF bit is used as the keyboard
buffer register full flag or as the KCLK fall interrupt
flag. When KBFSEL is cleared to 0, the KBE bit in
KBCRL should be cleared to 0 to disable reception.
0: KBF bit is used as KCLK fall interrupt flag
1: KBF bit is used as keyboard buffer register full flag
(KCLK and KD signal pins have port functions)
transmission and reception (KCLK and KD signal
pins are in the bus drive state)
Rev. 2.0, 08/02, page 467 of 788