Event-Trigger Submodule Registers
Table 4-23. Event-Trigger Selection Register (ETSEL) Field Descriptions (continued)
Bits Name Value Description
2-0 INTSEL ePWM Interrupt (EPWMx_INT) Selection Options
000 Reserved
001 Enable event time-base counter equal to zero. (TBCTR = 0x0000)
010 Enable event time-base counter equal to period (TBCTR = TBPRD)
011 Reserved
100 Enable event time-base counter equal to CMPA when the timer is incrementing.
101 Enable event time-base counter equal to CMPA when the timer is decrementing.
110 Enable event: time-base counter equal to CMPB when the timer is incrementing.
111 Enable event: time-base counter equal to CMPB when the timer is decrementing.
Figure 4-24. Event-Trigger Prescale Register (ETPS)
15 14 13 12 11 10 9 8
SOCBCNT SOCBPRD SOCACNT SOCAPRD
R-0 R/W-0 R-0 R/W-0
7 4 3 2 1 0
Reserved INTCNT INTPRD
R-0 R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 4-24. Event-Trigger Prescale Register (ETPS) Field Descriptions
Bits Name Description
15-14 SOCBCNT ePWM ADC Start-of-Conversion B Event (EPWMxSOCB) Counter Register
These bits indicate how many selected ETSEL[SOCBSEL] events have occurred:
00 No events have occurred.
01 1 event has occurred.
10 2 events have occurred.
11 3 events have occurred.
13-12 SOCBPRD ePWM ADC Start-of-Conversion B Event (EPWMxSOCB) Period Select
These bits determine how many selected ETSEL[SOCBSEL] events need to occur before an
EPWMxSOCB pulse is generated. To be generated, the pulse must be enabled
(ETSEL[SOCBEN] = 1). The SOCB pulse will be generated even if the status flag is set from
a previous start of conversion (ETFLG[SOCB] = 1). Once the SOCB pulse is generated, the
ETPS[SOCBCNT] bits will automatically be cleared.
00 Disable the SOCB event counter. No EPWMxSOCB pulse will be generated
01 Generate the EPWMxSOCB pulse on the first event: ETPS[SOCBCNT] = 0,1
10 Generate the EPWMxSOCB pulse on the second event: ETPS[SOCBCNT] = 1,0
11 Generate the EPWMxSOCB pulse on the third event: ETPS[SOCBCNT] = 1,1
11-10 SOCACNT ePWM ADC Start-of-Conversion A Event (EPWMxSOCA) Counter Register
These bits indicate how many selected ETSEL[SOCASEL] events have occurred:
00 No events have occurred.
01 1 event has occurred.
10 2 events have occurred.
11 3 events have occurred.
112 Registers SPRU791D – November 2004 – Revised October 2007
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