MICROPROCESSOR AND INTERFACE DESIGN 8051 Microcontroller Dis

MICROPROCESSOR AND INTERFACE DESIGN

8051 Microcontroller

Disassemble the following code. What does the program do?

0020 12 Lcall addr16 ;this is long call for calling the subroutine in other segment with 16 bit address

0021 00 NOP ; no operation used to insert the time

0022 27 ADD A,@R; used to add the contents present in the address saved in register R to the contents of the accumulator A

0023 80 SJMP offset;short jump with in the address of 8 bits

0024 F0 MOVX @DPTR,A;move the contents present in A to the address mention in dptr

0025 00 NOP;no operation

0026 FF MOV R7,A;move the contents of A to register 7

0027 7D MOV R5,#immediate data;move the data directly to register5

0028 FF MOV R7,A;move the contents of accumulator A to register 7

0029 FE MOV R6,A;move the contents of A to register 6

002A 22 RET ;return to the main program