El lenguaje ensamblador del microcontrolador 51 realiza una división de 16 bits
;Programa de división sin signo de doble byte (R5R2R3R4/R6R7)=(R2)R3R4 resto R6R7
;Entrada: R5, R2, R3, R4, R6, R7
; p>
; Recursos ocupados: ACC, B, F0
; Requisito de pila: 4 bytes
; R6, R7, OV
NDIV42: MOV A, R1
PUSH A
MOV B, #00H
NDV421: MOV A , R2
p>CLR C
SUBB A, R7
MOV R1, A
MOV A, R5
SUBB A, R6
JC NDV422
MOV R5, A
MOV A, R1
MOV R2, A
INC B
SJMP NDV421
NDV422: PUSH B
MOV B, #10H
NDV423: CLR C
MOV A, R4
RLC A
MOV R4, A
MOV A, R3
RLC A
MOV R3, A
MOV A, R2
RLC A
MOV R2, A
XCH A, R5
RLC A
XCH A, R5
MOV F0, C
CLR C
SUBB A, R7
MOV R1, A
MOV A, R5
SUBB A, R6
JB F0, NCV424
JC NDV425
NCV424: MOV R5, A
MOV A, R1
MOV R2, A
INC R4
NDV425: DJNZ B, NDV423
POP A
CLR OV
JNZ NDV426
SETB OV
NDV426: XCH A, R2
MOV R7, A
MOV A, R5
MOV R6, A
POP A
MOV R1, A
RET