Datasheet

Section 17 Keyboard Buffer Controller
Rev. 4.00 Sep 27, 2006 page 561 of 1130
REJ09B0327-0400
17.1.2 Block Diagram
Figure 17.2 shows a block diagram of the keyboard buffer controller.
KD
(PS2AD,
PS2BD,
PS2CD)
KDI
KCLKI
KDO
KCLKO
Parity
Register counter value
KB interrupt
KCLK
(PS2AC,
PS2BC,
PS2CC)
Legend:
KD: KBC data I/O pin
KCLK: KBC clock I/O pin
KBBR: Keyboard data buffer register
KBCRH: Keyboard control register H
KBCRL: Keyboard control register L
Control
logic
KBBR
KBCRH
KBCRL
Bus interface
Internal
data bus
Module data bus
Figure 17.2 Block Diagram of Keyboard Buffer Controller