Hi Foster,

What is your reason for having RETURN instructions in your ISR (interrupt
service routine) as opposed to RETFIE instructions? Keep in mind that when
an interrupt occurs, global interrupts are disabled (GIE = 0). When you exit
an ISR with either a RETURN or RETLW instruction, you will definitely
return, but then global interrupts are left disabled. Is that what you
intended? The RETFIE instruction will re-enable global interrupts (GIE = 1).

Best regards,

Ken Pergola

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