ST72325_07 datasheet(57/196 Pages) STMICROELECTRONICS

Part #	ST72325

Description	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface

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WATCHDOG TIMER (Cont’d)

10.1.4 How to Program the Watchdog Timeout

Figure 36 shows the linear relationship between

the 6-bit value to be loaded in the Watchdog Coun-

ter (CNT) and the resulting timeout duration in mil-

liseconds. This can be used for a quick calculation

without taking the timing variations into account. If

more precision is needed, use the formulae in Fig-

ure 37.

Caution: When writing to the WDGCR register, al-

ways write 1 in the T6 bit to avoid generating an

immediate reset.

Figure 36. Approximate Timeout Duration

Watchdog timeout (ms) @ 8 MHz. fOSC2

3F

00

38

128

1.5

65

30

28

20

18

10

08

50

34

18

82

98

114

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