MCS-51 单片机设计应用程序实例 - Read
MCS-51 单片机设计应用程序实例 - Read
MCS-51 单片机设计应用程序实例 - Read
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MOV P1,A<br />
LCALL DL1MS<br />
INC R1<br />
MOV A,P3<br />
JNB ACC.3,ENDOUT<br />
RL A<br />
MOV R5,A<br />
MOV P3,#0FFH<br />
AJMP PLAY<br />
ENDOUT: MOV P3,#0FFH<br />
MOV P1,#0FFH<br />
RET<br />
<strong>MCS</strong>-<strong>51</strong> 系 列 单 片 机 设 计 实 例<br />
TAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFH<br />
;<br />
;<br />
DL1MS: MOV R6,#14H ;1MS 延 时子程序<br />
DL1: MOV R7,#19H<br />
DL2: DJNZ R7,DL2<br />
;<br />
DJNZ R6,DL1<br />
RET<br />
TEST: CLR A ;模 数转换子程序<br />
MOV P2,A<br />
MOV R0,#70H ;转 换值存放首址<br />
MOV R7,#08H ;转 换 8次控制<br />
LCALL TESTART ;启 动 测 试<br />
WAIT: JB P3.7,MOVD ;等 A/D 转换结束信号<br />
;<br />
AJMP WAIT<br />
TESTART: SETB P2.3 ;测 试启动<br />
;<br />
NOP<br />
NOP<br />
CLR P2.3<br />
SETB P2.4<br />
NOP<br />
NOP<br />
CLR P2.4<br />
NOP<br />
NOP<br />
NOP<br />
NOP<br />
RET<br />
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