SH7101 datasheet(311/560 Pages) RENESAS

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Section 9 Watchdog Timer

Rev.1.00 Sep. 18, 2008 Page 277 of 522

REJ09B0069-0100

TCNT value

H'FF

H'00

WDTOVF

signal

Internal reset

signal*

Overflow

H'00 written

in TCNT

WT/

IT = 1

TME = 1

H'00 written

in TCNT

WT/

IT = 1

TME = 1

WOVF = 1

WDTOVF and internal

reset generated

128

φ clocks

512

φ clocks

WT/IT: Timer mode select bit

TME:

Timer enable bit

Note: * Internal reset signal occurs only when the RSTE bit is set to 1.

Time

Figure 9.2 Operation in Watchdog Timer Mode

9.4.2

Interval Timer Mode

To use the WDT as an interval timer, clear WT/

IT to 0 and set TME to 1 in TCSR. An interval

timer interrupt (ITI) is generated each time the timer counter (TCNT) overflows. This function can

be used to generate interval timer interrupts at regular intervals.

TCNT value

H'FF

H'00

Overflow

WT/

= 0

TME = 1

Overflow

ITI

Time

ITI: Interval timer interrupt request generation

Figure 9.3 Operation in Interval Timer Mode

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