Hi Bruce. I didn't understand where in the code the OP is enabling a A1 timer interrupt. It seems to me that hes working only on the A0 timer in these lines: TIMER_A0->CTL = TIMER_A_CTL_SSEL__SMCLK | TIMER_A_CTL_ID__1 | TIMER_A_CTL_MC__CONTINUOUS | TIMER_A_CTL_CLR | TIMER_A_CTL_IE; TIMER_A0->EX0 = TIMER_A_EX0_IDEX__1;
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