FEDL66525-02

OKI Semiconductor

ML66525 Family

8/27

PIN DESCRIPTIONS

In the Type column, “I” indicates an input pin, “O” indicates an output pin, and “I/O” indicates an I/O pin.

A symbol with “n” suffixed indicates an active Low pin.

Description

Classification

Symbol

Type

Primary function

Type

Secondary function

P0_0/D0

to

P0_7/D7

I/O

8-bit I/O port

Pull-up resistors can be

specified for each bit.

I/O

External memory access

data I/O port

P1_0/A8

to

P1_7/A15

I/O

8-bit I/O port

Pull-up resistors can be

specified for each bit.

O

External memory access

address output port

P2_0/A16

to

P2_3/A19

I/O

4-bit I/O port

Pull-up resistors can be

specified for each bit.

O

External memory access

address output port

P3_1/PSENn

I/O

1-bit I/O port

Pull-up resistors can be

specified.

O

External program memory

access read strobe output pin

P3_2/RDn

O

1-bit output port

O

External data memory access

read strobe output pin

P3_3/WRn

I/O

1-bit I/O port

Pull-up resistors can be

specified.

O

External data memory access

write strobe output pin

P4_0/A0

to

P4_7/A7

I/O

8-bit I/O port

Pull-up resistors can be

specified for each bit.

O

External memory access

address output port

P6_0/EXINT0

I

External interrupt 0 input pin

P6_1/EXINT1

I

External interrupt 1 input pin

P6_2/EXINT2

I

External interrupt 2 input pin

P6_3/EXINT3

I/O

4-bit I/O port

Pull-up resistors can be

specified for each bit.

I

External interrupt 3 input pin

P7_6/PWM0OUT

O

PWM0 output pin

P7_7/PWM1OUT

I/O

2-bit I/O port

Pull-up resistors can be

specified for each bit.

O

PWM1 output pin

P8_0/RXD1

I

SIO1 receive data input pin

P8_1/TXD1

O

SIO1 transmit data output pin

P8_2/RXC1

I/O

SIO1 receive clock I/O pin

Port

P8_3/TXC1

I/O

4-bit I/O port

Pull-up resistors can be

specified for each bit.

I/O

SIO1 transmit clock I/O pin