Datasheet

Section 8 I/O Ports
Rev. 3.00 Mar 21, 2006 page 209 of 788
REJ09B0300-0300
• PA2/A18/KIN10/CIN10/PS2AC
The pin function is switched as shown below according to the combination of operating mode,
the KBIOE bit in KBCRH_0 of the keyboard buffer controller, the IOSE bit in SYSCR, and
the PA2DDR bit.
Operating
Mode
Modes 1, 2 (EXPE = 0), 3 Mode 2 (EXPE = 1)
KBIOE 0 1 0 1
PA2DDR 0 1 — 0 1 —
IOSE ———— 0 1 —
PA2
input pin
PA2
output pin
PS2AC
output pin
PA2
input pin
A18
output pin
PA2
output pin
PS2AC
output pin
Pin Function
KIN10 input pin, CIN10 input pin, PS2AC input pin
*
Note: * When the KBIOE bit is set to 1, this pin is an NMOS open-drain output, and has direct
bus drive capability. This pin can always be used as the PS2AC, KIN10, or CIN10 input
pin.
• PA1/A17/KIN9/CIN9
The pin function is switched as shown below according to the combination of operating mode,
the IOSE bit in SYSCR and the PA1DDR bit.
Operating
Mode
Modes 1, 2 (EXPE = 0), 3 Mode 2 (EXPE = 1)
PA1DDR 0 1 0 1
IOSE — — — 0 1
PA1
input pin
PA1
output pin
PA1
input pin
A17
output pin
PA1
output pin
Pin Function
KIN9 input pin, CIN9 input pin
*
Note: * This pin can always be used as the KIN9 or CIN9 input pin.