M30620FCAFP datasheet(39/274 Pages) MITSUBISHI

39 / 274 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Wait Mode

Table 1.10.3. Port status during wait mode

Memory expansion mode

Single-chip mode

Microprocessor mode

_______

Address bus, data bus, CS0 to CS3

Retains status before wait mode

_____

______

________

_________

RD, WR, BHE, WRL, WRH

“H”

__________

HLDA,BCLK

“H”

ALE

“H”

Port

Retains status before wait mode

CLKOUT

When fC selected

Valid only in single-chip mode

Does not stop

When f8, f32 selected Valid only in single-chip mode

Does not stop when the WAIT

peripheral function clock stop

bit is “0”.

When the WAIT peripheral

function clock stop bit is “1”,

the status immediately prior

to entering wait mode is main-

tained.

Wait Mode

When a WAIT instruction is executed, the BCLK stops and the microcomputer enters the wait mode. In this

mode, oscillation continues but the BCLK and watchdog timer stop. Writing “1” to the WAIT peripheral

function clock stop bit and executing a WAIT instruction stops the clock being supplied to the internal

peripheral functions, allowing power dissipation to be reduced. Table 1.10.3 shows the status of the ports in

wait mode.

Wait mode is cancelled by a hardware reset or an interrupt. If an interrupt is used to cancel wait mode, the

microcomputer restarts from the interrupt routine using as BCLK, the clock that had been selected when the

WAIT instruction was executed.

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