Capture Sequence For Absolute Time-Stamp With Rising And Falling Edge Detect - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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8.7.2 Example 2 - Absolute Time-Stamp Operation Rising and Falling Edge Trigger
In Figure 8-24 the eCAP operating mode is almost the same as in the previous section except capture
events are qualified as either rising or falling edge, this now gives both period and duty cycle information,
i.e: Period1 = t – t
3
Cycle1 (off-time %) = (t
Figure 8-24. Capture Sequence for Absolute Time-stamp With Rising and Falling Edge Detect
CEVT1
CAPx pin
FFFFFFFF
CTR[0−31]
t
1
00000000
MOD4
0
CTR
CAP1 XX
CAP2 XX
CAP3
CAP4
Polarity selection
SPRUHE8E – October 2012 – Revised November 2019
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, Period2 = t – t , ...etc. Duty Cycle1 (on-time %) = (t
1 5 3
– t ) / Period1 x 100%, etc.
3 2
CEVT2
CEVT3
t
3
t
2
1 2
t
1
XX
XX
Capture registers [1−4]
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CEVT4 CEVT2
CEVT1
t
6
t
5
t
4
3 0 1
t
2
t
3
t
4
C28 Enhanced Capture (eCAP) Module
Application of the ECAP Module
– t ) / Period1 x 100%, etc. Duty
2 1
CEVT4
CEVT3 CEVT1
t
9
t
8
t
7
2 3 0
t
5
t
6
t
7
t
8
t
t
849