IZD1520U

8

TERMINAL DESCRIPTION

Terminal Name

Function

D0

÷ D7

Data I/O

A0

Select display data or functions.

HIGH: Display data

LOW : Instructions

RES

Resets the system and selects the interface type for a 68-port/80-port MPU

HIGH: 68-port MPU interface

LOW : 80-port MPU interface

CS

Input. Active low. Effective for an external clock operation model only.

OSC1

Chip Select input

LOW : Active level sensing

E

(RD)

Read/Write Enable signal when a 68-port MPU is connected.

(Active LOW Read Enable signal when an 80-port MPU is connected)

R/W

(WR)

Read/Write Select signal when a 68-port MPU is connected.

HIGH: Read Select

LOW : Write Select

(Active LOW Write Enable input when an 80-port MPU is connected Rising

edge sensing)

CL

Input. Effective for an external clock operation model only.

OSC2

External clock input (only effective with external clock types)

FR

LCD Frame (AC- conversion) signal input/output

SEGn

Segment output for driving the LCD

COMn

Common output for driving the LCD

M/S

Master/Slave Select signal

5V power supply

0V power supply (GND level)