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Rev. 1.00, 05/04, page 127 of 544
• PA5/KIN13/PS2BD
The pin function is switched as shown below according to the combination of the KBIOE bit in
KBCRH_1 of the keyboard buffer controller, and the PA5DDR bit.
KBIOE 0 1
PA5DDR 0 1 —
PA5 input pin PA5 output pin PS2BD output pin Pin Function
KIN13 input pin, PS2BD input pin*
Note: * When the KBIOE bit is set to 1 or the IICS bit in STCR 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 PS2BD or KIN13 input pin.
• PA4/KIN12/PS2BC
The pin function is switched as shown below according to the combination of the KBIOE bit in
KBCRH_1 of the keyboard buffer controller, and the PA4DDR bit.
KBIOE 0 1
PA4DDR 0 1 —
PA4 input pin PA4 output pin PS2BC output pin Pin Function
KIN12 input pin, PS2BC input pin*
Note: * When the KBIOE bit is set to 1 or the IICS bit in STCR 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 PS2BC or KIN12 input pin.
• PA3/KIN11/PS2AD
The pin function is switched as shown below according to the combination of the KBIOE bit in
KBCRH_0 of the keyboard buffer controller, and the PA3DDR bit.
KBIOE 0 1
PA3DDR 0 1 —
PA3 input pin PA3 output pin PS2AD output pin Pin Function
KIN11 input pin, PS2AD 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 PS2AD or KIN11 input pin.