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MSP432P401R, MSP432P401M

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SLAS826 –MARCH 2015

6.8.7 Watchdog Timer (WDT_A)

The primary function of the WDT_A module is to perform a controlled system restart after a software

problem occurs. If the selected time interval expires, a system reset is generated. If the watchdog function

is not needed in an application, the module can be configured as an interval timer and can generate

interrupts at selected time intervals.

The watchdog can generate a reset either on a time-out or a password violation. This reset can be

configured to generate either a Hard Reset or a Soft Reset into the system. Refer to the MSP432P4xx

Family Technical Reference Manual for more details.

Table 6-25. WDT_A Clocks

NORMAL OPERATION

WDTSSELx

(WATCHDOG AND INTERVAL TIMER MODE)

00 SMCLK

01 ACLK

10 VLOCLK

11 BCLK

CAUTION

The WDT must be set to interval mode before transitioning into the LPM3 or

LPM3.5 modes of operation. This allows the WDT event to wake the device

and return it to active modes of operation. Using the WDT in watchdog mode

may result in nondeterministic behavior due to the generated reset.

6.8.7.1 Watchdog Reset Control Register [Address = E004_3008h]

Figure 6-15. SYS_WDTRESET_CTL Register

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Reserved

r r r r r r r r r r r r r r r r

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Reserved VIOLA TIMEO

TION UT

r r r r r r r r r r r r r r rw-1 rw-1

Table 6-26. SYS_WDTRESET_CTL Register Description

Bit Field Type Reset Description

31-2 Reserved R 0h Reserved. Reads return 0h

1 VIOLATION RW 1h

0b = WDT password violation event generates Soft reset

1b = WDT password violation event generates Hard reset

0 TIMEOUT RW 1h

0b = WDT time-out event generates Soft reset

1b = WDT time-out event generates Hard reset

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