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6.18 Enhanced Capture (eCAP) Peripheral
The C6745/6747 device contains up to three enhanced capture (eCAP) modules.
functional block diagram of a module. See the TMS320C6745/C6747 DSP Peripherals Overview
Reference Guide. (SPRUFK9) for more details.
Uses for ECAP include:
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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 cuty cycle encoded current/voltage sensors
The ECAP module described in this specification includes the following features:
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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
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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 SYSCLK2 rate.
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TMS320C6745, TMS320C6747
SPRS377F – SEPTEMBER 2008 – REVISED JUNE 2014
Peripheral Information and Electrical Specifications
Figure 6-42
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