UPD75066CU-XXX データシートの表示（PDF） - NEC => Renesas Technology

部品番号

コンポーネント説明

メーカー

UPD75066CU-XXX

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75064, 75066, 75068, 75064(A), 75066(A), 75068(A)

7. STANDBY FUNCTION

The µPD75068 has two different standby modes (STOP mode and HALT mode) to reduce power dissipation

while waiting for program execution.

Table 7-1. Standby Mode Statuses

Instruction for setting

System clock for setting

Opera-

tion

status

Clock oscillator

Basic interval

timer

Serial interface

Timer/event

counter

Watch timer

A/D converter

External

interrupt

CPU

Release signal

STOP mode

STOP instruction

Can be set only when operating on the

main system clock.

Only the main system clock stops its

operation.

Does not operate.

Can operate only when the external SCK

input is selected for the serial clock.

Can operate only when the TI0 pin input

is selected for the count clock.

Can operate when fXT is selected as the

count clock.

Does not operate.

INT1, INT2, and INT4 can operate.

Only INT0 cannot operate.

Does not operate.

An interrupt request signal from hard-

ware whose operation is enabled by the

interrupt enable flag or the RESET signal

input

HALT mode

HALT instruction

Can be set either with the main system

clock or the subsystem clock.

Only the CPU clock Φ stops its operation

(oscillation continues).

Can operate only at main system clock

oscillation (IRQBT is set at reference

time intervals.).

Can operate only when external SCK

input is selected as the serial clock or at

main system clock oscillation.

Can operate only when TI0 pin input is

specified as the count clock or at main

system clock oscillation.

Can operate.

Can operate.Note

An interrupt request signal from hard-

ware whose operation is enabled by the

interrupt enable flag or the RESET signal

input

Note A/D converter's operation in HALT mode is possible only when the main system clock operates.

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