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AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
6.28 Enhanced Capture (eCAP) Peripheral
The device contains up to three enhanced capture (eCAP) modules.
diagram of a module.
Uses for ECAP include:
•
Speed measurements of rotating machinery (e.g. toothed sprockets sensed via Hall sensors)
•
Elapsed time measurements between position sensor triggers
•
Period and duty cycle measurements of pulse train signals
•
Decoding current or voltage amplitude derived from duty cycle encoded current/voltage sensors
The ECAP module described in this specification includes the following features:
•
32 bit time base
•
4 event time-stamp registers (each 32 bits)
•
Edge polarity selection for up to 4 sequenced time-stamp capture events
•
Interrupt on either of the 4 events
•
Single shot capture of up to 4 event time-stamps
•
Continuous mode capture of time-stamps in a 4 deep circular buffer
•
Absolute time-stamp capture
•
Difference mode time-stamp capture
•
All the above resources are dedicated to a single input pin
The eCAP modules are clocked at the ASYNC3 clock domain rate.
228
Peripheral Information and Electrical Specifications
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AM1808
Figure 6-76
shows a functional block
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