SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
An interrupt can be generated on capture events CEVT1 through CEVT4, CNTOVF (see the ECAP_ECINT_EN_FLG[21] CNTOVF_FLG bit) or APWM events (TSCNT = PRD, TSCNT = CMP). See Figure 12-2575.
A counter overflow event (FFFF FFFFh->0000 0000h) is also provided as an interrupt source (CNTOVF).
The capture events are edge and sequencer qualified (that is, ordered in time) by the polarity select and Mod4 gating, respectively.
One of these events can be selected as the interrupt source (from the ECAPn module) going to the interrupt controller.
Seven interrupt events (CEVT1, CEVT2, CEVT3, CEVT4, CNTOVF, TSCNT = PRD, TSCNT = CMP) can be generated. The interrupt enable register (ECAP_ECINT_EN_FLG) is used to enable/disable individual interrupt event sources. The interrupt flag register (ECAP_ECINT_EN_FLG) indicates if any interrupt event has been latched and contains the global interrupt flag ECAP_ECINT_EN_FLG[16] INT_FLG bit. An interrupt pulse is generated to the interrupt controller only if any of the interrupt events are enabled, the flag bit is 1h, and the INT_FLG flag bit is 0h. The interrupt service routine must clear the global interrupt flag bit and the serviced event via the interrupt clear register (ECAP_ECINT_CLR_FRC) before any other interrupt pulses are generated. The interrupt force register (ECAP_ECINT_CLR_FRC) can force an interrupt event. This is useful for test purposes.