STC89C53RC datasheet(60/165 Pages) STC

60 / 165 page

LJMP addr16

Function:

Long Jump

Description:

LJMP causes an unconditional branch to the indicated address, by loading the high-order

and low-order bytes of the PC (respectively) with the second and third instruction bytes. The

destination may therefore be anywhere in the full 64K program memory address space. No

flags are affected.

Example:

The label “JMPADR” is assigned to the instruction at program memory location 1234H. The

instruction,

LJMP JMPADR

at location 0123H will load the program counter with 1234H.

Bytes:

Cycles:

Encoding:

0 0 0 0

0 0 1 0

addr15-addr8

addr7-addr0

Operation:

LJMP

(PC) ← addr

← addr

addr

15-0

MOV

<dest-byte> , <src-byte>

Function:

Move byte variable

Description:

The byte variable indicated by the second operand is copied into the location specified by the

first operand. The source byte is not affected. No other register or flag is affected.

This is by far the most flexible operation. Fifteen combinations of source and destination

addressing modes are allowed.

Example:

Internal RAM location 30H holds 40H. The value of RAM location 40H is 10H. The data

present at input port 1 is 11001010B (0CAH).

MOV

R0, #30H

;R0< = 30H

MOV

A, @R0

;A < = 40H

MOV

R1, A

;R1 < = 40H

MOV

B, @Rl

;B < = 10H

MOV

@Rl, Pl

;RAM (40H) < = 0CAH

MOV

P2, P1

;P2 #0CAH

leaves the value 30H in register 0,40H in both the Accumulator and register 1,10H in register

B, and 0CAH(11001010B) both in RAM location 40H and output on port 2.

MOV A,Rn

Bytes:

Cycles:

Encoding:

1 1 1 0

1 r r r

Operation:

MOV

(A) ← (Rn)

← (Rn)

(Rn)

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