UPD78C18 datasheet(7/110 Pages) NEC

7 / 110 page

µPD78C17,78C18

PIN FUNCTIONS

1.1

LIST OF PIN FUNCTION (1/2)

Function

Pin Name

I/O

PA7 to PA0

(Port A)

Input-output

8-bit input-output port, which can specify input/output (Port A) bit-wise.

8-bit input-output port, which can specify input/output (Port B) bit-wise.

PB7 to PB0

(Port B)

Input-output

Port C

8-bit input-output port,

which can specify input/output bit-wise.

PC1/RxD

Receive Data

Input pin for serial data.

Input-output/

Input

PC0/TXD

Input-output/

Output

Transmit Data

Output pin for serial data.

Serial Clock

Input-output pin for serial clock.

It becomes output pin for the internal clock

use, and input pin for the external.

PC2/SCK

Interrupt Request/Timer Input

Maskable interrupt input pin of the

edge trigger (falling edge), or an

external clock input pin for a timer.

Also, it can be used as a zero-cross

detection pin for AC input.

Input-output/

Input/Input

PC3/INT2/TI

PC4/TO

Timer Output

Square wave defining one cycle of

internal clock or timer counter time as

half cycle is output.

Input-output/

Output

Input-output/

Input

PC5/CI

Counter Input

External pulse input pin to timer/event

counter.

PC6/CO0

PC7/CO1

Counter Output 0, 1

Programmable square wave output by

timer/event counter.

Input-output/

Output

PD7 to PD0/

AD7 to AD0

Input-output/

Input-output

Address/Data Bus

When external memory is used, it

becomes multiplexed address/data bus.

Port D

8-bit input-output port, which can specify

input/output in byte units (

µPD78C18).

PF7 to PF0/

AB15 to AB8

Input-output/

Output

Port F

8-bit input-output port, which can specify

input/output bit-wise.

Address Bus

When external memory is used, it

becomes address bus.

Output

Strobe signal which is output for write operation of external memory. It becomes high

in any cycle other than the data write machine cycle of external memory. When RESET

signal is either low or in the hardware STOP mode, this signal becomes output high-

impedance.

(Write Strobe)

Output

(Read Strobe)

Output

ALE

(Address Latch

Enable)

Strobe signal which is output for read operation of external memory. It becomes high in

any cycle other than the read machine cycle of external memory. When RESET signal is

either low or in the hardware STOP mode, this signal becomes output high-impedance.

Strobe signal to latch externally the lower address information which is output to PD7 to

PD0 pins to access external memory. When RESET signal is either low or in the hardware

STOP mode, this signal becomes output high-impedance.

Input-output/

Input-output

UPD78C18 Datasheet(PDF) 7 Page - NEC

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