Toothed
wheel
Period
counter
55 56 57 0
T1
T2
T3
T4
T3 > 2 x T2
Gap flag
Criteria flag
Tick counter
P(n-1) T1 T2 T4
ACNT
2
4
3
5
1
1
2
4
3
5
When TCNT = teeth register, the Gap flag is raised
Tick CNT reloads automatically with 2x the step-width because the Gap flag = ’1’
The tick counter is not reloaded because the Criteria flag is raised
If PCNT ( n ) > 2 x PCNT ( n-1 ) and the Gap flag = ’1’ then the Criteria flag is raised
The Gap flag and tooth active edge reset, followed by ACNT
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Angle Functions
1001
SPNU563A–March 2018
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High-End Timer (N2HET) Module
Figure 23-42. Singularity Check, ACNT Reset and Timing Associated