Summary
The opcodes that move data between locations within the 8051 and between the 8051 and external memory have been discussed. The general form and results of these instructions are as follows.
|
Instruction Type |
Result |
|
MOV destination, source |
Copy data from the internal RAM source address to the internal RAM destination address |
|
MOVC A, source |
Copy internal or external program memory byte from the source to register A |
|
MOVX destination, source |
Copy byte to or from external RAM to register A |
|
PUSH source |
Copy byte to internal RAM stack from internal RAM source |
|
pop destination |
Copy byte from internal RAM stack to internal RAM destination |
|
XCH A, source |
Exchange data between register A and the internal RAM source |
|
XCHD A, source |
Exchange lower nibble between register A and the internal RAM source |
There are four addressing modes: an immediate number, a register name, a direct internal RAM address, and an indirect address contained in a register.