Texas Instruments MSP430x4xx Family User Manual page 416

Watchdog Timer Registers
WDTCTL, Watchdog Timer Register
15 14
7 6
WDTHOLD WDTNMIES
rw−0 rw−0
WDTPW Bits
15-8
WDTHOLD Bit 7
WDTNMIES Bit 6
WDTNMI Bit 5
WDTTMSEL Bit 4
WDTCNTCL Bit 3
WDTSSEL Bit 2
WDTISx Bits
1-0
12-8 Watchdog Timer, Watchdog Timer+
13 12
Read as 069h
WDTPW, must be written as 05Ah
5 4
WDTNMI WDTTMSEL
rw−0 rw−0
Watchdog timer password. Always read as 069h. Must be written as 05Ah, or
a PUC will be generated.
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
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
Watchdog timer NMI select. This bit selects the function for the RST/NMI pin.
0 Reset function
1 NMI function
Watchdog timer mode select
0 Watchdog mode
1 Interval timer mode
Watchdog timer counter clear. Setting WDTCNTCL = 1 clears the count value
to 0000h. WDTCNTCL is automatically reset.
0 No action
1 WDTCNT = 0000h
Watchdog timer clock source select
0 SMCLK
1 ACLK
Watchdog timer interval select. These bits select the watchdog timer interval
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
11 10
3 2
WDTCNTCL WDTSSEL
r0(w) rw−0
9 8
1 0
WDTISx
rw−0 rw−0