ST72F324J2TCRE View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72F324J2TCRE

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

ST72324xx-Auto

On-chip peripherals

Figure 30. Watchdog block diagram

fOSC2

MCC/RTC

Div 64

Reset

WDGA T6

Watchdog Control register (WDGCR)

T5 T4 T3 T2 T1 T0

6-bit downcounter (CNT)

12-bit MCC

RTC counter

MSB

LSB

TB[1:0] bits

(MCCSR

) 11

65

0 register)

WDG prescaler

Div 4

uct(s 10.1.4

solete Prod Caution:

How to program the Watchdog timeout

Figure 31 shows the linear relationship between the 6-bit value to be loaded in the

Watchdog Counter (CNT) and the resulting timeout duration in milliseconds. This can be

used for a quick calculation without taking the timing variations into account. If more

precision is needed, use the formulae in Figure 32.

When writing to the WDGCR register, always write 1 in the T6 bit to avoid generating an

immediate reset.

Ob Figure 31. Approximate timeout duration

) - 3F

ct(s 38

rodu 30

P28

lete 20

Obso 18

10

08

00

1.5

18

34

50

65

82

98

Watchdog timeout (ms) @ 8 MHz. fOSC2

114

128

Doc ID 13841 Rev 1

67/193

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