UPD784938 datasheet(54/733 Pages) NEC

Part #	UPD784938

Description	16-Bit Single-Chip Microcontrollers

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Manufacturer	NEC [NEC]

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CHAPTER 2 PIN FUNCTIONS

54

Preliminary User’s Manual U13987EJ1V0UM00

(2) Non-port pins (2/2)

Pin Name

Input/Output

Alternate Function

Function

ASTB

Output

CLKOUT

Time division address (A0 to A7) latch timing output (during external memory access)

CLKOUT

Output

ASTB

Clock output

PWM0

Output

—

PWM output 0

PWM1

Output

—

PWM output 1

RX

Input

—

Data input (IEBus)

TX

Output

—

Data output (IEBus)

REGC

—

Connection of capacitor for regulator output stabilization/power supply when

regulator stops

REGOFF

—

Regulator operation specification signal

RESET

Input

—

Chip reset

X1

Input

—

System clock oscillation crystal connections

X2

—

(clock can also be input to X1)

XT1

Input

—

Watch clock connection

XT2

—

ANI0 to ANI7

Input

P70 to P77

A/D converter analog voltage inputs

AVREF1

—

A/D converter reference voltage application

AVDD

A/D converter positive power supply

AVSS

A/D converter GND

VDD

Positive power supply

VSS

GND

IC

Input

VPP

Internally connected. Connect directly to VSS (IC test pin).

VPP

IC

Flash memory programming mode setting.

High voltage application during program write/verify.

Connect directly to VSS in normal operating mode.

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