程序清單：
	ORG		0000H
MAX7219:DIN		BIT P1.1	；定義變量
		CLK		BIT P1.2
		LOAD    BIT P1.1
		LED_BF  EQU 50H	 	；顯示數(shù)據(jù)首址
		AJMP	MAIN
MAIN:	MOV 	SP.#70H
		LCALL	PROCESS		；設(shè)置MAX7219初始值
		LCALL	DISPLAY		；顯示
WAIT;						；其他程序省略
		
		SJMP 	WAIT
		;MAX7219初始化子程序
PROCECC :MOV	A,#0BH
		MOV		B,#07H
		LCALL	W_7219
		MOV A,#09H
		MOV B,#00H
		LCALL W_7219
		MOV A,##0AH
		MOV B,#09H
		LCALL W_7219
		MOV A,#0CH
		MOV B,#01H
		LCALL W_7219
		RET
		;MAX7219顯示子程序
DISPLAY:MOV R0,#LED_BF		
		MOV R4,#01H
		MOV R3,#08H
C_DISP:MOV A,@R0
		MOV B,A
		MOV A,R4
		LCALL W_7219
		INC R0
		INC R4
		DJNZ R3,C_DISP
		RET
W_7219:CLR LOAD
		LCALL SD_7219
		MOV A,B
		LCALL SD_7219
		SETB LOAD
		RET
		
SD_7219:MOV R6,#08H
C_SD:NOP
		CLR	CLK
		RLC A
		MOV DIN,C
		NOP
		SETB CLK
		DJNZ R6,C_SD
		RET