第2个回答 2020-01-12
ORG 0000H LJMP MAIN ORG 0030H MAIN: MOV A,#0FEH MOV B,#0FFH MOV R2,#16 LOOP: MOV P1,A MOV P2,B LCALL DELAY CLR C RLC A XCH A,B RLC A XCH A,B DJNZ R2,LOOP MOV R2,#3 LOOP1: MOV P1,#00H MOV P2,#00H LCALL DELAY MOV P1,#0FFH MOV P2,#0FFH LCALL DELAY DJNZ R2,LOOP1 SJMP $ DELAY: MOV R3,#200 DLY: MOV R4,#250 DJNZ R4,$ DJNZ R3,DLY RET END