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Any access, read or write, of the TAIV register automatically resets the highest
pending interrupt flag. If another interrupt flag is set, another interrupt is
immediately generated after servicing the initial interrupt. For example, if the
TACCR1 and TACCR2 CCIFG flags are set when the interrupt service routine
accesses the TAIV register, TACCR1 CCIFG is reset automatically. After the
RETI instruction of the interrupt service routine is executed, the TACCR2
CCIFG flag will generate another interrupt.
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