Problem 5 Write an assembly program to find the 2s Complemen

Problem 5: Write an assembly program to find the 2’s Complement of the value 85H. Notice that 85H is -123. Use the I/O view tool and PORTD as a destination to store your answer. Explain you answer. Hint: (Use instruction “NEG”)

Problem 6: Write an assembly program to show the output of the following Assembly code. Use the I/O view tool and PORTD as a destination to store your answer. Explain you answer.

LDI R0, 0X40

CLC

ROR R20

ROR R20

ROR R20

ROR R20

OUT PORTD, R20

Solution

5.

CLRF TRISD                      ; PORT D = OUTPUT

MYREG EQU 0x10

MOVLW 0x85

MOVWF MYREG

NEGF MYREG