
CHAPTER 2 PIN FUNCTIONS
User’s Manual U14579EJ2V0UM
54
2.2.5
Keyboard interface signals
Table 2-6. Keyboard Interface Signals
Signal Name
I/O
Function
KPORT(7:0)/GPIO(15:8)
I/O
These are keyboard scan data input signals. They are used to scan for pressed keys on
the keyboard.
When these are used as KPORT signals, external pull-down resistors are required.
When these are not used as KPORT signals, they can be used as general-purpose I/O
ports.
KSCAN(7:0)/GPIO(7:0)
I/O
These are keyboard scan data output signals. The scan line is set to active when
scanning for pressed keys on the keyboard.
When these are not used as KSCAN signals, they can be used as general-purpose I/O
ports.
KSCAN8/PS2CLK2
I/O
This is a keyboard scan data output signal. The scan line is set to active when scanning
for pressed keys on the keyboard.
When this is not used as a KSCAN signal, it can be used as a PS2CLK2 signal.
KSCAN9/PS2DATA2
I/O
This is a keyboard scan data output signal. The scan line is set to active when scanning
for pressed keys on the keyboard.
When this is not used as a KSCAN signal, it can be used as a PS2DATA2 signal.
KSCAN10/PS2CLK1
I/O
This is a keyboard scan data output signal. The scan line is set to active when scanning
for pressed keys on the keyboard.
When this is not used as a KSCAN signal, it can be used as a PS2CLK1 signal.
KSCAN11/PS2DATA1
I/O
This is a keyboard scan data output signal. The scan line is set to active when scanning
for pressed keys on the keyboard.
When this is not used as a KSCAN signal, it can be used as a PS2DATA1 signal.
2.2.6
PS/2 interface signals
Table 2-7. PS/2 Interface Signals
Signal Name
I/O
Function
PS2CLK1/KSCAN10
I/O
This is a PS/2 port 1 clock signal.
When this is not used as a PS2CLK1 signal, it can be used as a KSCAN10 signal.
PS2CLK2/KSCAN8
I/O
This is a PS/2 port 2 clock signal.
When this is not used as a PS2CLK2 signal, it can be used as a KSCAN8 signal.
PS2DATA1/KSCAN11
I/O
This is a PS/2 port 1 serial data signal.
When this is not used as a PS2DATA1 signal, it can be used as a KSCAN11 signal.
PS2DATA2/KSCAN9
I/O
This is a PS/2 port 2 serial data signal.
When this is not used as a PS2DATA2 signal, it can be used as a KSCAN9 signal.