M37640E8FP 데이터 시트보기 (PDF) - Mitsumi

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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.25.2 Wait Mode

Use of the wait mode allows the microcomputer to be

placed in a state where excitation of the CPU is

stopped, but the clocks to the peripherals continue to

oscillate. This mode provides lower power dissipation

during the idle periods and quick wake-up time. The

microcomputer enters the wait mode when the WIT

instruction is executed.

Returning from wait mode is accomplished just as it is

when returning from stop mode, with the exception

that you need not provide time for the oscillator to sta-

bilize, because the oscillation never stopped.

Additionally, any peripheral interrupt can be used to

bring the microcomputer out of the wait mode. The

timing for the WIT instruction is shown in Figure 1.98.

Xin

Φout

INTREQ

STPSIG

SYNCout

RD

WR

Address

Data

PC

Opcode

PC + 1

Invalid

Note: Return from a WIT instruction is caused by a interrupt. Sleep Period

Fig. 1.98. WIT Cycle Timing Diagram (WIT)

S,CPMA2

(PC + 1)

Start of Interrupt Service Routine

78

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