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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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STC89LE52RC 数据表(PDF) 105 Page - STCmicro Technology Co,.Ltd |
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STC89LE52RC 数据表(HTML) 105 Page - STCmicro Technology Co,.Ltd |
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105 / 165 page  ;--------------------------------------------------------------------------------------- UART: ;Serial port interrupt service routine JBC RI, UART_1 RETI ;Inquire when transmitting UART_1: ;Receive one byte PUSH ACC MOV A, SBUF ;Get the received byte ACALL Send_One_Byte ;Send back the received byte POP ACC RETI ;------------------------------------------------------------------------------------- Initial_UART: ;Initialize serial port ;BIT 7 6 5 4 3 2 1 0 ;SCON SM0/FE SM1 SM2 REN TB8 RB8 TI RI MOV SCON, #50H ;0101,0000 8-bit variable baud rate, no parity Init_RS232: MOV A #RELOAD_COUNT_HIGH ;Baud auto-reload value MOV RCAP2H,A MOV TH2, A MOV A, #RELOAD_COUNT_LOW MOV RCAP2L,A MOV TL2, A MOV T2CON, #0x34 ;Timer 2 as baud rate generator SETB ES ;Enable serial port interrupt SETB EA RET ;------------------------------------------------------------------------------------- ;Send_One_Byte: ;Send one byte CLR ES CLR TI ;clear UART transmit interrupt flag MOV SBUF, A WAIT2: JNB TI, WAIT2 ;Wait to finish transmitting CLR TI SETB ES RET ;---------------------------------------------------------------------------------------- END ;---------------------------------------------------------------------------------------- 105 |
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