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实用新型
CN202205194U 一种多功能下载电路 失效 - 权利终止

一种多功能下载电路
摘要：
本实用新型公开一种多功能下载电路，其包括，一串口及一JTAG，所述的串口具有TXD和RXD两根数据线，JTAG具有STCK和STIO两根数据线，所述的RXD数据线与所述的STCK数据线相连接。本实用新型实现了JTAG下载同时使用串口监听，由STAG信号线发出握手信号后，自动进行串口程序下载，且在信号线复用的情况下，通过增加单向导流元件实现了串口监听数据且在串口下载时对JTAG数据没有影响。
摘要（英）：

he utility model discloses a multifunctional downloading circuit which comprises a serial port and a JTAG (Joint Test Action Group), wherein the serial port is provided with a TXD (transmit data) data line and an RXD (receive data) data line; the JTAG is provided with an STCK data line and an STIO data line; and the RXD data line is connected with the STCK data line. The utility model implements monitoring with the serial port in the JTAG downloading process; after the STAG signal line transmits a handshaking signal, a serial port program is automatically downloaded; and under the signal wire multiplexing conditions, a one-way diversion element is added to implement data monitoring with the serial port, and no influence is acted on the JTAG data in the serial port downloading process.

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