OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
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6.18 Enhanced Capture (eCAP) Peripheral
The OMAP-L137 device contains up to three enhanced capture (eCAP) modules.
Figure 6-42
shows a
functional block diagram of a module. See the
OMAP-L137 Applications Processor DSP Peripherals
Overview Reference Guide.
(
SPRUGA6
) for more details.
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 cuty 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 SYSCLK2 rate.
148
Peripheral Information and Electrical Specifications
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