HD64F2145 Datasheet, PDF (506/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Figure 17.2 shows how the keyboard buffer controller is connected.
Vcc Vcc
System side
KCLK in
KCLK out
Clock
Keyboard side
KCLK in
KCLK out
KD in
KD out
Data
KD in
KD out
Keyboard buffer controller
(This LSI)
I/F
Figure 17.2 Keyboard Buffer Controller Connection
17.2 Input/Output Pins
Table 17.1 lists the input/output pins used by the keyboard buffer controller.
Table 17.1 Pin Configuration
Channel Name
Abbreviation* I/O
Function
0
KBC clock I/O pin (KCLK0) PS2AC
I/O
KBC clock input/output
KBC data I/O pin (KD0)
PS2AD
I/O
KBC data input/output
1
KBC clock I/O pin (KCLK1) PS2BC
I/O
KBC clock input/output
KBC data I/O pin (KD1)
PS2BD
I/O
KBC data input/output
2
KBC clock I/O pin (KCLK2) PS2CC
I/O
KBC clock input/output
KBC data I/O pin (KD2)
PS2CD
I/O
KBC data input/output
Note:* These are the external I/O pin names. In the text, clock I/O pins are referred to as KCLK
and data I/O pins as KD, omitting the channel designations.
Rev. 2.0, 08/02, page 466 of 788