Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

INSIDE THE

8051 MOV Instruction (cont’)

‰Notes on programming

¾Value (proceeded with #) can be loaded directly to registers A, B, or R0 – R7

ƒMOV A,

#23H

ƒMOV R5, #

0F9H

¾If values 0 to F moved into an 8-bit register, the rest of the bits are assumed all zeros

ƒ“MOV A, #5

”, the result will be A=05; i.e., A

= 00000101 in binary

¾Moving a value that is too large into a register will cause an error

ƒMOV A, #7F2H

If it’s not preceded with #, it means to load from a memory location ; ILLEGAL: 7F2H>8 bits (FFH)

Add a 0 to indicate that F is a hex number and not a letter