UPD178004A datasheet(19/56 Pages) NEC

Part #	UPD178004A

Description	8-BIT SINGLE-CHIP MICROCONTROLLERS

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Manufacturer	NEC [NEC]

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µPD178004A, 178006A, 178016A, 178018A

3-wire serial I/O mode

Function

Serial Interface Channel 1

—

Serial Interface Channel 0

(MSB/LSB first switchable)

3-wire serial I/O mode with automatic

transmission/ reception function

SBI (serial bus interface) mode

2-wire serial I/O mode

—

I2C Bus Mode

—

(MSB first)

5.5 A/D CONVERTER

An A/D converter of 8-bit resolution

× 6 channels is incorporated.

The following two types of the A/D conversion operation start-up methods are available.

• Hardware start

• Software start

Figure 5-7. A/D Converter Block Diagram

Tap

Selector

INTAD

VDD

INTP3

Internal Bus

GND

A/D Conversion

Result Register (ADCR)

Control

Circuit

Succesive Approximation

Register (SAR)

Edge

Detection

Circuit

ANI0/P10

ANI1/P11

ANI2/P12

ANI3/P13

ANI4/P14

ANI5/P15

INTP3/P03

Selector

Sample & Hold Circuit

Voltage Comparator

Resistor String

5.6 SERIAL INTERFACES

2 channels of the clocked serial interface are incorporated.

• Serial interface channel 0

• Serial interface channel 1

Table 5-2. Types and Functions of Serial Interface

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