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1. Write a program at address 0x100 in PIC18F assembly language to add two 32-bit packed BCD numbers.

- BCD number 1 is stored in data registers from 0x20 to 0x23, with the least significant digit at register 0x23 and the most significant digit at 0x20.
- BCD number 2 is stored in data registers from 0x30 to 0x33, with the least significant digit at register 0x33 and the most significant digit at 0x30.
- Store the result as packed BCD digits in registers 0x20 through 0x23.

Answer :

Final answer:

To add two 32-bit packed BCD numbers in PIC18F assembly language, you can follow the steps below:

  1. Load the least significant digit of BCD number 1 from memory location 0x23 into a register.
  2. Load the least significant digit of BCD number 2 from memory location 0x33 into another register.
  3. Add the two digits together and store the result in a register.
  4. If there is a carry from the addition, add it to the next pair of digits.
  5. Repeat steps 2-4 for the remaining digits, moving from least significant to most significant.
  6. Store the final result in memory locations 0x20 through 0x23.

Here is an example program in PIC18F assembly language that adds two 32-bit packed BCD numbers:

ORG 0x100 ; Start at memory address 0x100

; Load BCD number 1

MOVWF 0x24 ; Load least significant digit

MOVWF 0x25

MOVWF 0x26

MOVWF 0x27

; Load BCD number 2

MOVWF 0x34 ; Load least significant digit

MOVWF 0x35

MOVWF 0x36

MOVWF 0x37

; Add the digits

ADDWF 0x24, F ; Add least significant digits

BCDADD 0x25, 0x35 ; Add next pair of digits

BCDADD 0x26, 0x36

BCDADD 0x27, 0x37

; Store the result

MOVWF 0x20 ; Store least significant digit

MOVWF 0x21

MOVWF 0x22

MOVWF 0x23

; End of program

END

Explanation:

To add two 32-bit packed BCD numbers in PIC18F assembly language, we can follow the following steps:

  1. Load the least significant digit of BCD number 1 from memory location 0x23 into a register.
  2. Load the least significant digit of BCD number 2 from memory location 0x33 into another register.
  3. Add the two digits together and store the result in a register.
  4. If there is a carry from the addition, add it to the next pair of digits.
  5. Repeat steps 2-4 for the remaining digits, moving from least significant to most significant.
  6. Store the final result in memory locations 0x20 through 0x23.

Here is an example program in PIC18F assembly language that adds two 32-bit packed BCD numbers:

ORG 0x100 ; Start at memory address 0x100

; Load BCD number 1

MOVWF 0x24 ; Load least significant digit

MOVWF 0x25

MOVWF 0x26

MOVWF 0x27

; Load BCD number 2

MOVWF 0x34 ; Load least significant digit

MOVWF 0x35

MOVWF 0x36

MOVWF 0x37

; Add the digits

ADDWF 0x24, F ; Add least significant digits

BCDADD 0x25, 0x35 ; Add next pair of digits

BCDADD 0x26, 0x36

BCDADD 0x27, 0x37

; Store the result

MOVWF 0x20 ; Store least significant digit

MOVWF 0x21

MOVWF 0x22

MOVWF 0x23

; End of program

END

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