Part Number: TMS320F28379D Hello experts, in my application I have to run the time-base submodule in up-down-count mode. At the time points 1, 2, 1, 2, ... (see picture) the interrupt routine MyInterrupt() should be triggered. The event for interrupt at time point 1: Time-base counter equal to compare B register (CMPB_1) when the timer is incrementing. The event for interrupt at time point 2: Time-base counter equal to compare B register (CMPB_2) if the timer is decrementing. Because I can only set one event as interrut source in the event trigger submodule, I have the following in mind to trigger the interrupts in the time points 1 and 2. At time 1, at the beginning of the interrupt routine MyInterrupt(): Counter-Compare B shadow register = CMPB_2 ETSEL[INTSELCMP] = 0 ETSEL[INTSEL] = 111 At time 2, at the beginning of the interrupt routine MyInterrupt(): Counter-Compare B shadow register = CMPB_1 ETSEL[INTSELCMP] = 0 ETSEL[INTSEL] = 110 The loading of Counter-Compare B register from its shadow register ist done when Time-Base counter is equal to zero or period (TBCTR = 0x00 || TBCTR = TBPRD).There must be no problem here. My question is about updating register ETSEL. Is it possible to update this register "on the fly" as I have described above. Can there be problems or unpredictable behavior here? Thank you in advance for your reply - Bui
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