Can anyone just tell me why MCU8051IDE give an error on using a data like #A0....#FF
Ex- MOV A,#FFH give an error
while MOV A,#7FH works fine

 

MOV A, #0FFH will work.. For some reason MCU8051IDE use a "kind" of assembler based on ASEM-51.

The first character in a hexadecimal MUST be numeric.. I never have an issue as I always use 0xFF and not 0FFh anyway. ( That is if your copy is > version 1.4.1

 

Thanks.... 0xFF work fine !!