摘要
设计了一种基于"ATD+迭代法"的UART波特率发生电路。波特率发生电路中的ATD电路用于监测串行数据的变化,并在串行数据的边沿(上升沿或下降沿)输出低电平信号。波特率探测电路对ATD电路的输出信号的低电平和高电平分别进行计数,该计数值和保持寄存器中存储的最小值比较,若前者小于后者,则保存寄存器中的最小值被该计数值取代,若前者大于后者,则保存寄存器中的最小值不变。经过一段时间比较迭代,最终得到设计需要的最小值,从而通过波特率发生器正确地输出串行数据的波特率。
In our paper we design a UART baud-rate Generator based on ATD （Address-Translate-Detector） circuit. The ATD circuit is used to monitor the changes of serial data, and experts the low level signals along the rising edges or falling edges of serial data. Two counters are used for counting the numbers of low and high level periods of ATD signal respectively. The value stored in counters has been compared with the minimum value stored in register. If the former is less than the latter, then the minimum value will be replaced by the value stored in counters, otherwise, maintaining the latter. Repeating this process, we get the accurate baud-rate.
出处
《电子与封装》
2010年第9期19-23,共5页
Electronics & Packaging
