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SPRUI07–March 2020
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Enhanced Capture (eCAP)
5.3 Description
The eCAP module represents one complete capture channel that can be instantiated multiple times,
depending on the target device. In the context of this guide, one eCAP channel has the following
independent key resources:
• Dedicated input capture pin
• 32-bit time base (counter)
• 4 x 32-bit time-stamp capture registers (CAP1-CAP4)
• Four-stage sequencer (modulo4 counter) that is synchronized to external events, eCAP pin
rising/falling edges.
• Independent edge polarity (rising/falling edge) selection for all four events
• Input capture signal prescaling (from 2-62 or bypass)
• One-shot compare register (two bits) to freeze captures after 1-4 time-stamp events
• Control for continuous time-stamp captures using a four-deep circular buffer (CAP1-CAP4) scheme
• Interrupt capabilities on any of the four capture events
Multiple identical eCAP modules can be contained in a system as shown in Figure 5-1. The number of
modules is device-dependent and is based on target application needs.
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