UPD178002 datasheet(26/48 Pages) NEC

Part #	UPD178002

Description	8-BIT SINGLE-CHIP MICROCONTROLLERS

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26

µPD178002, 178003

Data Sheet U12628EJ3V0DS00

7. STANDBY FUNCTION

The following two standby functions are available for further reduction of system current consumption.

• HALT mode: In this mode, the CPU operation clock is stopped. The average current consumption can be

reduced by intermittent operation by combining this mode with the normal operation mode.

• STOP mode: In this mode, oscillation of the system clock is stopped. All the operations performed on the

system clock are suspended, resulting in extremely small power consumption.

Figure 7-1. Standby Function

8. RESET FUNCTION

The following two reset methods are available.

• External reset by RESET signal input

• Internal reset by Power On Clear (POC).

System clock operation

STOP mode

(System clock

oscillation stopped)

HALT mode

(Clock supply to CPU

halted, oscillation

maintained)

Interrupt

request

Interrupt

request

HALT

instruction

STOP

instruction

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