M306V2EEFS datasheet(41/271 Pages) RENESAS

41 / 271 page

Rev.1.40

Oct 06, 2004 page 41 of 269

M306V2ME-XXXFP, M306V2EEFP

Table 2.5.2 Port status during stop mode

Memory expansion mode

Single-chip mode

Microprocessor mode

_______

Address bus, data bus, CS0 to CS3

Retains status before stop mode

_____

______

________

_________

RD, WR, BHE, WRL, WRH

“H”

__________

HLDA, BCLK

“H”

ALE

“H”

Port

Retains status before stop mode Retains status before stop mode

CLKOUT

When fc selected

Valid only in single-chip mode

“H”

When f8, f32 selected

Valid only in single-chip mode

Retains status before stop mode

2.5.4 Clock Output

In single-chip mode, the clock output function select bits (bits 0 and 1 at address 000616) enable f8, f32, or

fc to be output from the P57/CLKOUT pin. When the WAIT peripheral function clock stop bit (bit 2 at

address 000616) is set to “1,” the output of f8 and f32 stops when a WAIT instruction is executed.

2.5.5 Stop Mode

Writing “1” to the all-clock stop control bit (bit 0 at address 000716) stops all oscillation and the microcom-

puter enters stop mode. In stop mode, the content of the internal RAM is retained provided that VCC

remains above 4.5V.

Because the oscillation, BCLK, f1 to f32, f1SIO2 to f32SIO2, fC, fC32, and fAD stops in stop mode, peripheral

functions such as the A-D converter and watchdog timer do not function. However, timer B operates

provided that the event counter mode is set to an external pulse, and UARTi (i = 0, 2) functions provided

an external clock is selected. Table 2.5.2 shows the status of the ports in stop mode.

Stop mode is cancelled by a hardware reset or an interrupt. If an interrupt is to be used to cancel stop

mode, that interrupt must first have been enabled. If returning by an interrupt, that interrupt routine is

executed.

When shifting from high-speed/medium-speed mode to stop mode and at a reset, the main clock division

select bit 0 (bit 6 at address 000616) is set to “1.” When shifting from low-speed/low power dissipation

mode to stop mode, the value before stop mode is retained.

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