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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 376 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
WWDT Window Setting Limitation
5.14.5.4
When user writes 0x00005AA5 to WWDT_RLDCNT register to reload WWDT counter value to
0x3F, it needs 3 WWDT clocks to sync the reload command to actually perform reload action.
Notice that if user set PSCSEL (WWDT_CTL[11:8]) to 0000, the counter prescale value should be
as 1, and the CMPDAT (WWDT_CTL[21:16]) must be larger than 2. Otherwise, writing
WWDT_RLDCNT register to reload WWDT counter value to 0x3F is unavailable, WWDTIF
(WWDT_STATUS[0]) is generated, and WWDT reset system event always happened.
PSCSEL
Prescale Value
Valid CMPDAT Value
0000
1
0x3 ~ 0x3F
0001
2
0x2 ~ 0x3F
Others
Others
0x0 ~ 0x3F
Table 5.14-2 CMPDA Setting Limitation