;VIET CT PHAT CHUOI KY TU HELLO,WORLD LEN MAY TINH THONG QUA HYPERTERMINAL ;VOI TOC DO BAUD 19200 MOI KHI SW 310 DUOC NHAN ORG 0000H MOV SCON,#52H // 0110 0010 TI=1 -> JNB TI TRUOC MOV SBUF,A MOV TMOD,#20H // 0010 0000: TIMER MODE ACALL DOUBLE_BAUD // GAP DOI TOC DO BAUD DO KO C� BANG TRA CUA 192000: 9600X2=19200 MOV TH1,#-3 // TRA BANG TOC DO BAUD 9600 MOV TL1,#-3 // NAP LAI GIA TRI SETB TR1 CHECK_SW1: JB P1.0,$ // KIEM TRA XEM P1.0 DUOC NHAN CHUA ACALL CHONGRUNG //CHONG RUNG PHIM MOV DPTR,#TABLE LAP: CLR A MOVC A,@A+DPTR JZ CHECK_SW1 ACALL OUTCHR INC DPTR JNZ LAP SJMP LAP OUTCHR: JNB TI,OUTCHR CLR TI MOV SBUF,A RET DOUBLE_BAUD: MOV A,PCON SETB ACC.7 MOV PCON,A RET CHONGRUNG: MOV R7,#2 // GUI DU LIEU TU A RA SBUF LOOP1: MOV R6,#250 LOOP2: MOV R5,#250 LOOP3: DJNZ R5,LOOP3 DJNZ R6,LOOP2 DJNZ R7,LOOP1 RET TABLE: DB "HELLO,WORLD",0 END