单片机与HD7279的子程序(共14页).doc

精选优质文档-倾情为你奉上1单片机与HD7279的子程序ORG 0100HSTART: MOV SP,#2FH MOV P1,#B LCALL DELAY25M MOV DATA_OUT,#0A4H LCALL SEND SETB CSMAIN: JB KEY,MAIN MOV D ATA_OUT,#15H LCALL SEND LCALL RECEIV SETB CS MOV A,DATA_IN ANI A,#0F0H SWAP A MOV TEN,A MOV A,DATA_IN ANL A,#0FH