NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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WWDT Reset System
5.14.5.3
When WWDTIF (WWDT_STATUS[0]) is generated, user must reload WWDT counter value to
0x3F by writing 0x00005AA5 to WWDT_RLDCNT register, and also to prevent WWDT counter
value reached to 0 and generate WWDT reset system signal to info system reset. If current
CNTDAT (WWDT_CNT[5:0]) is larger than CMPDAT (WWDT_CTL[21:16]) and user writes
0x00005AA5 to the WWDT_RLDCNT register, the WWDT reset system signal will be generated
immediately to cause chip reset also.
Comparator
6-bit compare value
CMPDAT
6-bit down counter
value CNTDAT
from 0x3F to 0x00
Write RLDCNT
0x5AA5 will
reset system
Write RLDCNT
0x5AA5 will
reload CNTDAT
to 0x3F
CNTDAT > CMPDAT
or CNTDAT = 0
CNTDAT <= CMPDAT
Figure 5.14-3 WWDT Reset and Reload Behavior