ST72321BXXX-AUTO datasheet(86/247 Pages) STMICROELECTRONICS

Part #	ST72321BXXX-AUTO

Description	8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Watchdog timer (WDG)

ST72321Bxxx-Auto

86/247

10.9

Register description

10.9.1

Control register (WDGCR)

WDGCR

Reset value: 0111 1111 (7Fh)

7

654

32

10

WDGA

T[6:0]

RW

Table 35.

WDGCR register description

Bit

Name

Function

7WDGA

Activation bit

This bit is set by software and only cleared by hardware after a reset. When

WDGA = 1, the watchdog can generate a reset.

0: Watchdog disabled

1: Watchdog enabled

Note: This bit is not used if the hardware watchdog option is enabled by option byte.

6:0

T[6:0]

7-bit counter (MSB to LSB)

These bits contain the value of the watchdog counter. It is decremented every 16384

fOSC2 cycles (approx.). A reset is produced when it rolls over from 40h to 3Fh (T6

becomes cleared).

Table 36.

Watchdog timer register map and reset values

Address

(Hex.)

Register

label

7654

3210

002Ah

WDGCR

Reset Value

WDGA

0

T6

1

T5

1

T4

1

T3

1

T2

1

T1

1

T0

1

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ST72321BXXX-AUTO Datasheet(PDF) 86 Page - STMicroelectronics

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