数码管显示有问题

ORG 0000H JMP START ORG 000BH JMP T0_INT;------------------------------START: MOV TMOD, #06H MOV TH0, #255 MOV TL0, #255 MOV IE, #82H SETB TR0 MOV R2, #0 MOV R3, #0 MOV DPTR, #TAB;------------------------------M_LOOP: MOV A, R3 MOVC A, @A + DPTR MOV P2, A MOV A, R2 MOVC A, @A + DPTR MOV P0, A SJMP M_LOOP;------------------------------T0_INT: JNB P3.4, T0_INT INC R3 CJNE R3, #10, T0_END MOV R3, #0 INC R2 CJNE R2, #10, T0_END MOV R2, #0T0_END: RETI;------------------------------TAB: DB 003FH;0 共阴 DB 0006H ;1 DB 005BH ;2 DB 004FH ;3 DB 0066H ;4 DB 006DH ;5 DB 007DH ;6 DB 0007H ;7 DB 007FH ;8 DB 006FH ;9;------------------------------ END这怎么改，我网上抄的，如果可以的话，帮我写个注释行么