15.3 Enhanced Capture (eCAP) Module
15.3.1 Introduction
15.3.1.1 Purpose of the Peripheral
Uses for eCAP include:
• Sample rate measurements of audio inputs
• Speed measurements of rotating machinery (for example, toothed sprockets sensed via Hall sensors)
• Elapsed time measurements between position sensor pulses
• Period and duty cycle measurements of pulse train signals
• 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:
• 32-bit time base counter
• 4-event time-stamp registers (each 32 bits)
• Edge polarity selection for up to four sequenced time-stamp capture events
• Interrupt on either of the four events
• Single shot capture of up to four event time-stamps
• Continuous mode capture of time-stamps in a four-deep circular buffer
• Absolute time-stamp capture
• Difference (Delta) mode time-stamp capture
• All above resources dedicated to a single input pin
• When not used in capture mode, the ECAP module can be configured as a single channel PWM output