UPD78064YGF-XXX-3BA(1992) データシートの表示（PDF） - NEC => Renesas Technology

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UPD78064YGF-XXX-3BA
(Rev.:1992)

8-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

mPD78062Y,78063Y,78064Y

7. STANDBY FUNCTION

H

The standby function is a function to reduce the consumption current and there are the following two kinds of

standby functions.

l HALT mode : Halts CPU operating clock and can reduce average consumption current by the intermittent

operation along with the normal operation.

l STOP mode : Halts main system clock oscillation. Halts all operations with the main system clock and sets

ultra-low consumption current state with subsystem clock only.

Fig. 7-1 Standby Function

Main System Clock Operation

Interrupt

Request

STOP

Instruction

CSS=1

CSS=0

Interrupt

Request

HALT Instruction

Subsystem Clock Operation*

Interrupt

Request

HALT Instruction

STOP Mode

( ) Main System Clock

Oscillation Halted

HALT Mode

( ) Clock Supply to CPU Halted,

Oscillation Maintained

HALT Mode*

( ) Clock Supply to CPU Halted,

Oscillation Maintained

* Halting the main system clock enables the consumption current to be reduced. When the CPU is operated by

the subsystem clock, the main system clock should be halted by a MCC setting. The STOP instruction is not

available.

Note When the main system clock is stopped and the system is operated by the subsystem clock, the main

system clock should be returned to after securing the oscillation stabilization time by a program.

8. RESET FUNCTION

There are the following two kinds of resetting methods.

Ý External reset by RESET pin.

Ý Internal reset by watchdog timer runaway time detection.

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