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PICList Thread
'multiprecision down counting'
1995\01\02@004822 by crocontroller discussion list

So here's what I thought was a clever trick:

On the PIC the DECF instruction doesn't reset carry on underflow so
implementing multiprecision down counters requires using the zero
state. This code will count down a 16 bit value in 4 cycles (16 clocks)

       MOVF    COUNT_LO_BYTE,F         ; Test this byte
       BTFSC   ZERO_BIT                ; (bit 2, f3)
       DECF    COUNT_HI_BYTE           ; Decrement the high byte
       DECF    COUNT_LO_BYTE           ; Decrement the low byte


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