Enhanced Capture (eCAP) Module
15.3 Enhanced Capture (eCAP) Module
15.3.1 Introduction
15.3.1.1 Purpose of the Peripheral
Uses for eCAP include:
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Sample rate measurements of audio inputs
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Speed measurements of rotating machinery (for example, toothed sprockets sensed via Hall sensors)
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Elapsed time measurements between position sensor pulses
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Period and duty cycle measurements of pulse train signals
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Decoding current or voltage amplitude derived from duty cycle encoded current/voltage sensors
15.3.1.2 Features
The eCAP module includes the following features:
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32-bit time base counter
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4-event time-stamp registers (each 32 bits)
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Edge polarity selection for up to four sequenced time-stamp capture events
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Interrupt on either of the four events
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Single shot capture of up to four event time-stamps
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Continuous mode capture of time-stamps in a four-deep circular buffer
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Absolute time-stamp capture
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Difference (Delta) mode time-stamp capture
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All above resources dedicated to a single input pin
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When not used in capture mode, the ECAP module can be configured as a single channel PWM output
1607
SPRUH73H – October 2011 – Revised April 2013
Pulse-Width Modulation Subsystem (PWMSS)
Copyright © 2011–2013, Texas Instruments Incorporated