newbie...need help in a small program...

#include<p16f877a.inc>
ORG 0X00
ADC1 EQU 0X40

MOVLW 0X27 ; 39 IN DEC
MOVWF ADC1

MOVLW 0X23 ; 35 IN DEC

SUBWF ADC1,1

END

after running the program the status bit is reading 0x1B and i am getting an message

CORE-W0014: Halted due to PC incrementing over the Maximum PC address and wrapping back to Zero

i tried keeping a CLRF STATUS after the sub operation even then i am getting status as 0x1B

why am i getting a carry and a digit carry?? can anyone please help me out....

You don't have enough there to make a working program - like it says it will simply keep incrementing and loop round, you need to have an actual line to prevent this - usually just an endless loop (a line jumping to itself).


Also, don't use lines like "SUBWF ADC1,1", use the correct labels from the include file - don't use 1 and 0.

Then check what subtract instructions on a PIC actual do, it's not quite what you probably think.

thank you.....probably i need to check out d subtraction operation...