HD64F2149 Datasheet, PDF (566/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

17.1.2 Block Diagram
Figure 17.2 shows a block diagram of the keyboard buffer controller.
KBBR
Internal
data bus
KD
(PS2AD,
PS2BD,
PS2CD)
KCLK
(PS2AC,
PS2BC,
PS2CC)
KDI
Control _KCLKI
logic
Parity
KDO
KCLKO
KBCRH
KBCRL
Register counter value
KB interrupt
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
Figure 17.2 Block Diagram of Keyboard Buffer Controller
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