Decrement value of Variable by one.
The DEC instruction subtracts one from the specified variable. If the variable holds zero it will roll over to its maximum value (255 for bytes, 65535 for words) after DEC.
flags VAR Byte(2) result VAR Word Main: flags(0) = 0 DEC flags(0) ' flags(0) = flags(0) - 1 result = $0000 DEC result ' result is now $FFFF
Related Instruction: INC and DJNZ