; Input: 32-bit Dividend in DIVIDEND3:DIVIDEND0
; 16-bit Divisor in DIVISORH:DIVISORL
; Output: 32-bit Quotient in QUOTIENT3:QUOTIENT0
; 16-bit Remainder in REMAINDERH:REMAINDERL
; Initialize Remainder and Quotient
CLRF REMAINDERH ; Clear Remainder (high byte)
CLRF REMAINDERL ; Clear Remainder (low byte)
CLRF QUOTIENT3 ; Clear Quotient (MSB)
CLRF QUOTIENT2 ; Clear Quotient
CLRF QUOTIENT1 ; Clear Quotient
CLRF QUOTIENT0 ; Clear Quotient (LSB)
; Loop counter for 32 bits
MOVLW 32 ; 32 iterations for 32-bit division
MOVWF COUNT ; Store loop counter
DIVIDE_LOOP:
; Shift left the Dividend and Quotient
RLNCF DIVIDEND0, F ; Shift left DIVIDEND0, LSB into Carry
RLNCF DIVIDEND1, F ; Shift left DIVIDEND1
RLNCF DIVIDEND2, F ; Shift left DIVIDEND2
RLNCF DIVIDEND3, F ; Shift left DIVIDEND3
RLNCF QUOTIENT0, F ; Shift left QUOTIENT0
RLNCF QUOTIENT1, F ; Shift left QUOTIENT1
RLNCF QUOTIENT2, F ; Shift left QUOTIENT2
RLNCF QUOTIENT3, F ; Shift left QUOTIENT3
; Shift left the Remainder with Carry
RLNCF REMAINDERL, F ; Shift left REMAINDERL
RLNCF REMAINDERH, F ; Shift left REMAINDERH
; Subtract Divisor from Remainder
MOVF DIVISORL, W ; Load Divisor (low byte)
SUBWF REMAINDERL, F ; Subtract from Remainder (low byte)
MOVF DIVISORH, W ; Load Divisor (high byte)
SUBWFB REMAINDERH, F ; Subtract with borrow from Remainder (high byte)
; Check if Remainder >= 0
BNC REMAINDER_NEG ; If Carry is clear, Remainder is negative
; Remainder is positive, set LSB of Quotient
BSF QUOTIENT0, 0 ; Set LSB of Quotient
BRA NEXT_ITERATION ; Continue to next iteration
REMAINDER_NEG:
; Remainder is negative, restore it by adding Divisor back
MOVF DIVISORL, W ; Load Divisor (low byte)
ADDWF REMAINDERL, F ; Add to Remainder (low byte)
MOVF DIVISORH, W ; Load Divisor (high byte)
ADDWFC REMAINDERH, F ; Add with carry to Remainder (high byte)
NEXT_ITERATION:
; Decrement loop counter and check if done
DECFSZ COUNT, F ; Decrement COUNT, skip if zero
BRA DIVIDE_LOOP ; Repeat for next bit
; Division complete
; Quotient is in QUOTIENT3:QUOTIENT0
; Remainder is in REMAINDERH:REMAINDERL