HD64F2145 datasheet(235/829 Pages) RENESAS

235 / 829 page

Rev. 2.0, 08/02, page 195 of 788

• PA4/A20/.,145/CIN12/PS2BC

The pin function is switched as shown below according to the combination of operating mode,

the KBIOE bit in KBCRH_1 of the keyboard buffer controller, the IOSE bit in SYSCR, and

the PA4DDR bit.

Operating

Mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA4DDR

—

IOSE

——

—

PA4

input pin

PA4

output pin

PS2BC

output pin

PA4

input pin

A20

output pin

PA4

output pin

PS2BC

output pin

Function

.,145 input pin, CIN12 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,

.,145, or CIN12 input pin.

• PA3/A19/.,144/CIN11/PS2AD

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 PA3DDR bit.

Operating

Mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA3DDR

—

IOSE

—

PA3

input pin

PA3 output

PS2AD

output pin

PA3

input pin

A19 output

PA3 output

PS2AD

output pin

Function

.,144 input pin, CIN11 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,

.,144, or CIN11 input pin.

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