FEDL66525-02
OKI Semiconductor
ML66525 Family
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.
Classification
Port
Symbol
Description
Type
Type
I/O
Primary function
8-bit I/O port
Pull-up resistors can be
specified for each bit.
Secondary function
External memory access
data I/O port
P0_0/D0
to
P0_7/D7
I/O
P1_0/A8
to
I/O
I/O
I/O
8-bit I/O port
Pull-up resistors can be
specified for each bit.
4-bit I/O port
Pull-up resistors can be
specified for each bit.
1-bit I/O port
Pull-up resistors can be
specified.
O
O
O
External memory access
address output port
P1_7/A15
P2_0/A16
to
P2_3/A19
External memory access
address output port
P3_1/PSENn
External program memory
access read strobe output pin
P3_2/RDn
P3_3/WRn
O
1-bit output port
1-bit I/O port
Pull-up resistors can be
specified.
O
O
External data memory access
read strobe output pin
External data memory access
write strobe output pin
I/O
P4_0/A0
to
I/O
I/O
8-bit I/O port
Pull-up resistors can be
specified for each bit.
4-bit I/O port
Pull-up resistors can be
specified for each bit.
O
External memory access
address output port
P4_7/A7
P6_0/EXINT0
P6_1/EXINT1
P6_2/EXINT2
P6_3/EXINT3
P7_6/PWM0OUT
P7_7/PWM1OUT
I
I
I
I
O
O
External interrupt 0 input pin
External interrupt 1 input pin
External interrupt 2 input pin
External interrupt 3 input pin
PWM0 output pin
I/O
I/O
2-bit I/O port
Pull-up resistors can be
specified for each bit.
4-bit I/O port
Pull-up resistors can be
specified for each bit.
PWM1 output pin
P8_0/RXD1
P8_1/TXD1
P8_2/RXC1
P8_3/TXC1
I
O
I/O
I/O
SIO1 receive data input pin
SIO1 transmit data output pin
SIO1 receive clock I/O pin
SIO1 transmit clock I/O pin
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