UPD6708 datasheet(5/72 Pages) NEC

5 / 72 page

µPD6708

PIN FUNCTIONS

1.1

List of Pin Functions

Pin No.

Pin Name

Input/Output

Function

I/O Format

At Reset

SCK

Input

Input for serial clock used to interface with microcontroller.

CMOS input

Input

Input for serial data used to interface with microcontroller.

CMOS input

Input

Output

Output for serial data used to interface with microcontroller.

CMOS output

High level

IRQ

Output

Output used by interrupt request signals generated by

CMOS output

Low level

communication and command execution results.

Used as operation start request signal to microcontroller.

The interrupt request signal is output for 8

µs or longer

at high level.

R/W

Input

Input for switching serial interface read/write mode.

CMOS input

Input

When high, it is in the read mode. When low, it is in the

write mode.

When this pin is low and C/D pin high, the read and write

modes can be switched by commands input from the serial

interface.

––

Connection pins for system clock resonator.

––

(Oscillation

Use a 12- or 12.58-MHz crystal, or ceramic resonator.

continues)

Frequency precision depends on the communication mode

used.

Mode 0

±1.5 %

Mode 1

±1.5 %

Mode 2

±0.5 %

GND

––

Ground

––

BUS–

Input/output

Input/output for IEBus.

––

High

BUS+

impedance

AVDD

––

IEBus driver/receiver analog power supply. Connect to VDD.

––

C/D

Input

Input used to switch between processing data input to the

CMOS input

Input

serial interface as commands or data.

When set to high, data is processed as commands; when

low, data is processed as data.

When this pin is high and R/W pin low, the read and write

modes can be switched by commands input from the serial

interface.

Input

Chip select input.

CMOS input

Input

When low, serial interface input is enabled.

When high, serial clock (SCK) input is disabled, SO pin

becomes high impedance, and the serial clock counter is

reset.

The status of CS pin is not affected by IEBus transmit and

receive operations.

RESET

Input

System reset signal input pin.

CMOS input

Input

Low input effects a reset.

Always input the low signal for 6

µs or longer after turning

on the power.

TEST

Input

Always connect this pin to the VDD.

CMOS input

––

VDD

––

Positive power supply input. Apply a voltage of 5 V

±10 %.

––

UPD6708 数据表(PDF) 5 Page - NEC

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