把一个数字分成四份分别放到AL,BL,CL,DL

DATA SEGMENT
N DB 12H
DATA ENDS
CODE SEGMENT
MAIN PROC FAR
ASSUME CS: CODE, DS: DATA
START: PUSH DS
MOV AX, 0
PUSH AX
MOV AX, DATA
MOV DS, AX

MOV BX, N

MOV CH, BH
MOV BL,CH
AND BL, 0F0H
MOV CL, 4
SHR BL, CL
MOV DH, BL

MOV BL, CH
AND BL, 0FH
MOV DL, BL

MOV BX, N

MOV CH, BL
AND CL, 0F0H
MOV CL, 4
SHR BL, CL

MOV AL, DH
MOV CL, BL
MOV DH, DL

MOV BL, CH
AND BL, 0FH
MOV DL, BL
MOV BL, DH

RET
MAIN ENDP
CODE ENDS
END START