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Rev. 1.00, 05/04, page 128 of 544
• PA2/KIN10/PS2AC
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 PA2DDR bit.
KBIOE 0 1
PA2DDR 0 1 —
PA2 input pin PA2 output pin PS2AC output pin Pin Function
KIN10 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 or KIN10 input pin.
• PA1/KIN9, PA0/KIN8
The pin function is switched as shown below according to the state of the PAnDDR bit.
PAnDDR 0 1
PAn input pin PAn output pin Pin Function
KINm input pin*
Note: * This pin can always be used as the KINm input pin. (n = 1 or 0, m = 9 or 8)
7.10.5 Port A Input Pull-Up MOS
Port A has an on-chip input pull-up MOS function that can be controlled by software. This input
pull-up MOS function can be specified as on or off on a bit-by-bit basis.
The input pull-up MOS for pins PA7 to PA4 is always off when IICS is set to 1. When the
keyboard buffer control pin function is selected for pins PA7 to PA2, the input pull-up MOS is
always off.
Table 7.6 summarizes the input pull-up MOS states.
Table 7.6 Input Pull-Up MOS States (Port A)
Reset Hardware Standby Mode Software Standby Mode In Other Operations
Off Off On/Off On/Off
[Legend]
Off: Input pull-up MOS is always off.
On/Off: On when the pin is in the input state, PADDR = 0, and PAODR = 1; otherwise off.