SH7708 datasheet(201/633 Pages) RENESAS

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183

9.10.5

Usage Notes

WTCNT should be set as shown below when using the WDT of the SH7708 (not including the

SH7708S and SH7708R) in watchdog timer mode or interval timer mode.

(a)

(b)

Yes

WTCNT setting

WTCNT =

set value + 1?

SLEEP instruction

WTCNT setting

SLEEP instruction

Wait for 2 WDT

count clock cycles

Perform either processing (a) or

processing (b). No processing is

required when the WDT is not used

(WTCSR.TME = 0). If this

processing is not performed, the

WDT count will stop in sleep mode.

(a) Read WTCNT and confirm that

it has been incremented, then

execute a SLEEP instruction.

(b) Wait for two WDT count clock

cycles after WTCNT is set, then

execute a SLEEP instruction.

Figure 9.6 To Operate the WDT in Sleep Mode

(a)

(b)

Yes

WTCNT setting

WTCNT =

set value + 1?

WTNCT instruction

WTCNT setting

WTCNT instruction

Wait for 2 WDT

count clock cycles

Perform either processing (a) or

processing (b). No processing is

required when the WDT is not used

(WTCSR.TME = 0). If this

processing is not performed, the

second WTCNT setting may not be

carried out.

(a)

After the first WTCNT setting,

read WTCNT and confirm that it

has been incremented, then

perform the next WTCNT

setting.

(b)

After the first WTCNT setting,

wait for two WDT count clock

Figure 9.7 To Perform Repeated WTCNT Settings

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