UPD7564 datasheet(6/56 Pages) NEC

6 / 56 page

µPD7564A, 7564A(A)

PIN FUNCTIONS

1.1

PORT FUNCTIONS

Pin Name

Input/Output

Dual-Function

Function

After RESET

Input/Output

Circuit

P00

Input

INT0

P01

Input/output

SCK

Input

P02

P03

Input

P80 to P82

Output

––

P100 to P103

Input/output

––

P110 to P113

Input/output

––

1.2

OTHER THAN PORTS

Pin Name

Input/Output

Dual-Function

Function

After RESET

Input/Output

Circuit

INT0

Input

P00

Edge detection testable input pin (Rising edge)

SCK

Input/output

P01

Serial clock Input/output pin

Input

Output

P02

Serial data output pin

Input

P03

Serial data input pin

Input

CL1

––

CL2

RESET

VDD

Positive power supply pin

VSS

GND potential pin

4-bit input port (Port 0)

P00 serves also as a count clock (event pulse)

input.

3-bit output port (Port 8)

High current (15 mA), middle-high voltage (9 V)

output

4-bit I/O port (Port 10)

Middle-high current (10 mA), middle-high voltage

(9 V) input/output

4-bit I/O port (Port 11)

Middle-high current (10 mA), middle-high voltage

(9 V) input/output

High

impedance

High

impedance

high-level

output

Connection pin for ceramic oscillation ceramic

resonator

System reset input pin (high-level active)

A pull-down resistor can be incorporated using

the mask option.

UPD7564 Datasheet(PDF) 6 Page - NEC

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