OMAPL138B-EP Datasheet, PDF (247/282 Pages) Texas Instruments – OMAPL138B C6-Integra DSP+ARM Processor

OMAPL138B-EP
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SPRS815B – DECEMBER 2011 – REVISED MARCH 2012
5.28 Enhanced Capture (eCAP) Peripheral
The device contains up to three enhanced capture (eCAP) modules. Figure 5-79 shows a functional block
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.
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Peripheral Information and Electrical Specifications 247
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