NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
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-M0 Microcontroller
Aug, 2018
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WWDT Window Setting Limitation
When user writes 0x00005AA5 to WWDTRLD register to reload WWDT counter value to 0x3F, it
needs 3 WWDT clocks to sync the reload command to actually perform reload action.
This means if user set PERIODSEL to 0000, the counter prescale value should be as 1, and the
WINCMP value must be larger than 2; otherwise, writing WWDTRLD to reload WWDT counter
value to 0x3F is unavailable while WWDTIF is generated and WWDT reset system event always
happened.
PERIODSEL
Prescale Value
Valid WINCMP Value
0000
1
0x3 ~ 0x3F
0001
2
0x2 ~ 0x3F
Others
Others
0x0 ~ 0x3F
Table 6.11-2 WINCMP Setting Limitation