P(n)
P(n+1)
HET[2]
ext. ref.
signal
APCNT
period
counter
SCNT
step
counter
ACNT
angle
generator
Deceleration Acceleration
ACF
Acceleration
K-1
0 1 2
0 1
2 0 1
flag
DCF
Deceleration
flag
K-1
Angle Functions
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SPNU563A–March 2018
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High-End Timer (N2HET) Module
ACNT detects period variations of the external signal measured by APCNT and compensates related
counting errors. A period increase is flagged in the deceleration flag. A period decrease is flagged in the
acceleration flag. If no variation is flagged, ACNT increments the counter value each time SCNT reaches
its target. If acceleration is detected, ACNT increments the counter value on each timer resolution (fast
mode). If deceleration is detected, ACNT is stopped. Figure 23-32 illustrates how the compensations for
acceleration and deceleration operate.
Figure 23-32. ACNT Period Variation Compensations
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