18B20的复位时序及子程序: init_1820: clr dq1820 mov r7,#40 acall Delay15us ；（1）复位：低电平至少480 us，用15*40=600us可靠 setb dq1820 ；（2）释放，为了在15-60 us后接收存在脉冲 mov r7,#1 acall Delay15us 20us mov r2,#90 ；（3） 最多等待（1+2）*90=270us wait: mov c,dq1820 jnc wait1 djnz r2,wait ；（4）在15-60 us后回发芯片一个存在脉冲，为了可靠，我们采用等到回发脉冲后在做下一步工作，存在脉冲是一个60-240us的低电平信号 wait1:

一款高精度测温电路设计程序.txt

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