; Only integer operations and non-zero operations are possible
end
Reference address：Single-byte division using left shift and subtraction
ORG 0000H
JMP A1
ORG 002BH
A1: MOV R0,#00001001B; dividend
MOV R1,#0; remainder
MOV R2,#0;
quotient MOV R5,#00000011B; divisor
MOV 33H,#8; left shift 8 times 16-bit division left shift 16 times
A2: MOV A,R0
RLC A
MOV R0,A
MOV A,R1
RLC A
MOV R1,A
JMP A1
ORG 002BH
A1: MOV R0,#00001001B; dividend
MOV R1,#0; remainder
MOV R2,#0;
quotient MOV R5,#00000011B; divisor
MOV 33H,#8; left shift 8 times 16-bit division left shift 16 times
A2: MOV A,R0
RLC A
MOV R0,A
MOV A,R1
RLC A
MOV R1,A
CLR C; Clear C because subtraction A = AC-R5
SUBB A, R5; Subtract the quotient from the shifted number
JC A3; Compare the size
MOV R1, A; If it is larger, save the remainder and subtract
A3 next time: CPL C; Quotient value processing
MOV A, R2; Quotient value shift
RLC A
MOV R2, A
DJNZ 33H, A2; Is it completed
JMP $
; Idea---As long as R1-R5 is not less than 0, the quotient is set to 1 and the remainder is assigned to R1
; R1 R5 R2
; 1. 00000000-00000011 is less than 0, and the quotient is 00000000
; 2. 00000000-00000011 is less than 0, and the quotient is 00000000
; 3. 00000000-00000011 is less than 0, and the quotient is 00000000
;4. 00000000-00000011 is less than 0, and the quotient is 00000000;
5. 00000001-00000011 is less than 0, and the quotient is 00000000
; 6. 00000010-00000011 is less than 0, and the quotient is 00000000
; 7. 00000100-00000011 is greater than 0, the quotient is 00000001, and the remainder is 00000001, which is assigned to R1
; 8. 00000011-00000011 is equal to 0, the quotient is 00000011, and the remainder is 00000000
; The algorithm is now complete
; Note: Single byte is cycled 8 times, if it is double byte, it will be cycled 16 times, and so on
SUBB A, R5; Subtract the quotient from the shifted number
JC A3; Compare the size
MOV R1, A; If it is larger, save the remainder and subtract
A3 next time: CPL C; Quotient value processing
MOV A, R2; Quotient value shift
RLC A
MOV R2, A
DJNZ 33H, A2; Is it completed
JMP $
; Idea---As long as R1-R5 is not less than 0, the quotient is set to 1 and the remainder is assigned to R1
; R1 R5 R2
; 1. 00000000-00000011 is less than 0, and the quotient is 00000000
; 2. 00000000-00000011 is less than 0, and the quotient is 00000000
; 3. 00000000-00000011 is less than 0, and the quotient is 00000000
;4. 00000000-00000011 is less than 0, and the quotient is 00000000;
5. 00000001-00000011 is less than 0, and the quotient is 00000000
; 6. 00000010-00000011 is less than 0, and the quotient is 00000000
; 7. 00000100-00000011 is greater than 0, the quotient is 00000001, and the remainder is 00000001, which is assigned to R1
; 8. 00000011-00000011 is equal to 0, the quotient is 00000011, and the remainder is 00000000
; The algorithm is now complete
; Note: Single byte is cycled 8 times, if it is double byte, it will be cycled 16 times, and so on
end
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for the TI dm6446 platformBackground subtraction moduleMaintain a background model, which can distin
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