Datasheet

Section 18 Keyboard Buffer Control Unit (PS2)
Rev. 3.00 Sep. 28, 2009 Page 563 of 910
REJ09B0350-0300
Figure 18.2 shows how the PS2 is connected.
Vcc
KCLK in
KCLK out
KD in
KD out
Keyboard buffer control unit
(This LSI)
System side
KCLK in
KCLK out
KD in
KD out
I/F
Keyboard side
Vcc
Clock
Data
Figure 18.2 PS2 Connection
18.2 Input/Output Pins
Table 18.1 lists the input/output pins used by the keyboard buffer control unit.
Table 18.1 Pin Configuration
Channel Name Abbreviation* I/O Function
PS2 clock I/O pin (KCLK0) PS2AC I/O PS2 clock input/output
0
PS2 data I/O pin (KD0) PS2AD I/O PS2 data input/output
PS2 clock I/O pin (KCLK1) PS2BC I/O PS2 clock input/output 1
PS2 data I/O pin (KD1) PS2BD I/O PS2 data input/output
PS2 clock I/O pin (KCLK2) PS2CC I/O PS2 clock input/output 2
PS2 data I/O pin (KD2) PS2CD I/O PS2 data input/output
3 PS2 clock I/O pin (KCLK3) PS2DC I/O PS2 clock input/output
PS2 data I/O pin (KD3) PS2DD I/O PS2 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.