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Figure 19.2 shows how the PS2 is connected.
KCLK in
KCLK out
KD in
KD out
Keyboard buffer control unit
19.2
Input/Output Pins
Table 19.1 lists the input/output pins used by the keyboard buffer control unit.
Table 19.1 Pin Configuration
Channel
Name
0
PS2 clock I/O pin (KCLK0)
PS2 data I/O pin (KD0)
1
PS2 clock I/O pin (KCLK1)
PS2 data I/O pin (KD1)
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.
System side
(This LSI)
Figure 19.2 PS2 Connection
Section 19 Keyboard Buffer Control Unit (PS2)
Vcc
Clock
Data
Abbreviation*
I/O
PS2AC
I/O
PS2AD
I/O
PS2BC
I/O
PS2BD
I/O
Rev. 1.00 May 09, 2008 Page 555 of 954
Keyboard side
KCLK in
KCLK out
KD in
KD out
Interface
Function
PS2 clock input/output
PS2 data input/output
PS2 clock input/output
PS2 data input/output
REJ09B0462-0100
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