R2 倍数 12mhz MOV R2，#20 ; 0.2sDELAY10MS: ;10ms START: MOV R7,#01HDL1: MOV R6,#0DEHDL0: MOV R5,#15H DJNZ R5,$ DJNZ R6,DL0 DJNZ R7,DL1 DJNZ R2,START RET
