yejinxs.asm

汇编语言开发的各种实用程序

            ORG  0000H
			LJMP MAIN
			ORG  0100H
MAIN:       
BUSY        EQU  P3.0
REQ         EQU  P3.1
            CLR  REQ
            SETB BUSY
			MOV    A,#0F9H  ;选显示8*16 ASCII字符命令字
			ACALL  SUB1     ;调用写子程序
			MOV	   A,#04H   ;04H，XX，8*8点阵为单位的屏幕坐标值X
			ACALL  SUB1
			MOV    A,#00H   ;00H，YY，1*1点阵为单位的屏幕坐标值Y
			ACALL  SUB1
			MOV	   A,#41H   ;AS，ASCII字符代码"A"
			ACALL  SUB1
SUB1:       JB 	 BUSY,SUB1
            MOV  P1,A
			NOP 
			SETB REQ
HEX3:       JNB  BUSY,HEX3
          	CLR  REQ
			RET

			END