Datasheet

117

TMS320F28379S

TMS320F28377S

TMS320F28376S, TMS320F28375S, TMS320F28374S

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SPRS881C –AUGUST 2014–REVISED MAY 2016

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5.9 Control Peripherals

NOTE

For the actual number of each peripheral on a specific device, see Table 3-1.

5.9.1 Enhanced Capture (eCAP)

The eCAP module can be used in systems where accurate timing of external events is important.

Applications for eCAP include:

• Speed measurements of rotating machinery (for example, toothed sprockets sensed through 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

The eCAP module includes the following features:

• 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 timestamps

• Continuous mode capture of timestamps in a four-deep circular buffer

• Absolute time-stamp capture

• Difference (Delta) mode time-stamp capture

• All of the 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

(APWM).

The eCAP inputs connect to any GPIO input through the Input X-BAR. The APWM outputs connect to

GPIO pins through the Output X-BAR to OUTPUTx positions in the GPIO mux. See Section 4.5.2 and

Section 4.5.3.

Figure 5-46 shows the block diagram of an eCAP module.