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主程序中，單片機將標準串口設置為115200bps,將模擬串口設置為19200bps。單片機將標準串口收到的數據從模擬串口發送出去，將模擬串口接收到的數據從標準串口發送回來。
txd0_data:
ldi status,(1<
push temp
in temp,gimsk
cbr temp,(1< out gimsk,temp ;disable gimsk/int0
pop temp
ser bit_cnt ;bit_cnt=0xff
mov sbuf0,temp ;send data
ldi temp,(256-N)
out TCNT0,temp ;wait 1 bit timer0 interrupt
in temp,tifr
sbr temp,(1< out tifr,temp ;clr tifr/tov0
in temp,timsk
sbr temp,(1< out timsk,temp ;enable timsk/toie0
cbi portb,txd0 ;uart start
ret
;******************************************
rxd0_data:
sbrs status,fe0 ;if fe0=0 then exit
rjmp rxd0_data_end
cbr status,(1< mov temp,sbuf0
rxd0_data_end:
ret
;******************************************
;uart received a byts from uart and then return it from uart0:
;uart received a byts from uart0 and then return it from uart :
main:
sbIC usr,rxc
rjmp send_115200
sbrs status,rdr
rjmp uart_end
send_19200:
rcall rxd0_data ;get uart data from 19200bps uart0
wait2: sbis usr,udrie
rjmp wait2
out udr,temp ;send data to 115200bps uart
rjmp uart_end www.qqzbd.com
send_115200:
in temp,udr ;get uart data from 115200bps uart
sbic usr,fe www.senvqq.com
rjmp uart_end ;if fe err then end
wait3: sbrc status,td ;wait send flag
rjmp wait3
rcall txd0_data ;send data to 19200bps uart0
uart_end:
rjmp main
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