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