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AM1808_12 Datasheet, PDF (226/262 Pages) Texas Instruments – ARM Microprocessor | |||
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AM1808
SPRS653C â FEBRUARY 2010 â REVISED DECEMBER 2011
www.ti.com
5.28 Enhanced Capture (eCAP) Peripheral
The device contains up to three enhanced capture (eCAP) modules. Figure 5-76 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.
226 Peripheral Information and Electrical Specifications
Copyright © 2010â2011, Texas Instruments Incorporated
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