SH7713 datasheet(345/904 Pages) RENESAS

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Section 10 Power-Down Modes

Rev.1.50 Aug. 30, 2006 Page 305 of 860

REJ09B0288-0150

WTCNT value

H'FF

H'80

Time

Interrupt

request

WDT overflow and branch to

interrupt handling routine

Crystal resonator settling

time and PLL synchronization

time

Clear bit STBCR.STBY before

WTCNT reaches H'80. When

STBCR. STBY is cleared, WTCNT

halts automatically.

Figure 10.1 Canceling Standby Mode with STBCR.STBY

• Canceling with a Reset

Software standby mode is canceled by a reset (power-on or manual). Keep the

RESETP or

RESETM pin low until the clock oscillation settles. The internal clock will continue to be output

to the CKIO pin.

10.3.3

Module Standby Function

Transition to Module Standby Function: Setting each MSTP bit in the standby control registers

to 1 halts the supply of clocks to the corresponding on-chip peripheral modules. This function can

be used to reduce the power consumption in normal or sleep mode. Before a transition is made, the

module should be disabled.

In the module standby state, the functions of the external pins of the on-chip peripheral modules

change depending on the on-chip peripheral module. For details, see section 1, Overview and Pin

Function. All of the register states are the same as those in standby mode. For details, see table

10.3.

Canceling Module Standby Function: The module standby function can be canceled by clearing

the MSTP bits to 0, or by a power-on reset.

To cancel the module standby function by clearing the corresponding MSTP bit to 0, read the

MSTP bit to check the MSTP bit was cleared correctly.

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