Texas Instruments MSP430x1xx manual WDTCTL, Watchdog Timer Register, WDTISx

Watchdog Timer Registers

WDTCTL, Watchdog Timer Register

15 14 13 12

11 10 9 8

Read as 069h

WDTPW, must be written as 05Ah

7 6 5 4

3 2 1 0

WDTHOLD

WDTNMIES

WDTNMI

WDTTMSEL WDTCNTCL WDTSSEL

WDTISx

rw−0 rw−0 rw−0 rw−0 r0(w) rw−0 rw−0 rw−0

WDTPW	Bits	Watchdog timer password. Always read as 069h. Must be written as 05Ah, or
	15-8	a PUC will be generated.
WDTHOLD	Bit 7	Watchdog timer hold. This bit stops the watchdog timer. Setting WDTHOLD
		= 1 when the WDT is not in use conserves power.
		0	Watchdog timer is not stopped
		1	Watchdog timer is stopped
WDTNMIES	Bit 6	Watchdog timer NMI edge select. This bit selects the interrupt edge for the
		NMI interrupt when WDTNMI = 1. Modifying this bit can trigger an NMI. Modify
		this bit when WDTNMI = 0 to avoid triggering an accidental NMI.
		0	NMI on rising edge
		1	NMI on falling edge
WDTNMI	Bit 5	Watchdog timer NMI select. This bit selects the function for the
				RST/NMI pin.
		0	Reset function
		1	NMI function
WDTTMSEL	Bit 4	Watchdog timer mode select
		0	Watchdog mode
		1	Interval timer mode
WDTCNTCL	Bit 3	Watchdog timer counter clear. Setting WDTCNTCL = 1 clears the count value
		to 0000h. WDTCNTCL is automatically reset.
		0	No action
		1	WDTCNT = 0000h
WDTSSEL	Bit 2	Watchdog timer clock source select
		0	SMCLK
		1	ACLK
WDTISx	Bits	Watchdog timer interval select. These bits select the watchdog timer interval
	1-0	to set the WDTIFG flag and/or generate a PUC.
		00	Watchdog clock source /32768
		01	Watchdog clock source /8192
		10	Watchdog clock source /512
		11	Watchdog clock source /64

10-8Watchdog Timer