hi,
My gosh you go through a huge hullabalu to increment the 16-bit value in R6::R7. Why it even necessary to involve the B register?

Michael, why it even necessary to involve the ACC register? (=

INC_R6R7:
    INC   R7
    CJNE  R7,#0x00,LOC_A
    INC   R6
LOC_A:

Regards,
Oleg