UPD178004A datasheet(27/56 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

7. STANDBY FUNCTION

There are the following two standby functions to reduce the system power consumption.

• HALT mode : The CPU operating clock is stopped.

The average consumption current can be reduced by intermittent operation in combination with

the normal operating mode.

• STOP mode : The system clock oscillation is stopped. All operations by the system clock are stopped and

current consumption can be considerably reduced.

Figure 7-1. Stand-by Function

System Clock Operation

STOP Mode

(System clock

oscillation stopped)

HALT Mode

(Clock supply to CPU is

stopped, oscillation

continued)

Interrupt

Request

Interrupt

Request

HALT

Instruction

STOP

Instruction

8. RESET FUNCTION

There are the following three reset methods.

• External reset input by RESET pin

• Internal reset by watchdog timer runaway time detection

• Internal reset by Power-On Clear (POC).

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