Renesas Single-Chip Microcomputer M37531T-ADS Información técnica descargar pdf (Pagina 51)

Mitsubishi microcomputer

M16C / 62A Grou

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTE

Wait Mode

Table 1.10.3. Port status during wait mode

Pin 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 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. However, peripheral function clock fc32

does not stop so that the peripherals using fc32 do not contribute to the power saving. When the MCU

running in low-speed or low power dissipation mode, do not enter WAIT mode with this bit set to “1”. 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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Renesas Single-Chip Microcomputer M37531T-ADS Información técnica Pagina 51