HD64F2149YV datasheet(282/1075 Pages) RENESAS

282 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 254 of 1044

REJ09B0280-0300

Selection Method and Pin Functions

PA4/A20/PS2BC/

KIN12/CIN12

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

operating mode, the KBIOE bit in KBCR1H of the keyboard buffer controller,

the IOSE bit in SYSCR, and bit PA4DDR.

Operating

mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA4DDR

—

IOSE

——

—

Pin function

PA4

input

PA4

output

PS2BC

output

PA4

input

A20

output

PA4

output

PS2BC

output

KIN12 input pin, CIN12 input pin, PS2BC input pin

When the IICS bit in STCR is set to 1, this pin functions as a bus buffer. This

pin can always be used as the PS2BC,

KIN12, or CIN12 input pin.

PA3/A19/PS2AD/

KIN11/CIN11

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

operating mode, the KBIOE bit in KBCR0H of the keyboard buffer controller,

the IOSE bit in SYSCR, and bit PA3DDR.

Operating

mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA3DDR

—

IOSE

——

—

Pin function

PA3

input

PA3

output

PS2AD

output

PA3

input

A19

output

PA3

output

PS2AD

output

KIN11 input pin, CIN11 input pin, PS2AD input pin

This pin can always be used as the PS2AD,

KIN11, or CIN11 input pin.

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