A method for upgrading dual-mode mobile phone via multiplexing serial port
A dual-mode mobile phone and serial port technology, which is applied in the field of upgrading dual-mode mobile phones through multiplexing serial ports, can solve the problems of cumbersome upgrade and maintenance process, increased workload, and increased capital investment in special equipment, so as to save costs and equipment. Invest, simplify the upgrade process, provide the effect of work efficiency
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[0017] When the dual-mode mobile phone is in normal use, the serial port is mainly used for the communication between the master and the slave module. When the dual-mode mobile phone needs to be upgraded, it is necessary to use the serial port to download the upgrade program from the PC to the dual-mode mobile phone. Switch the working mode. Generally, a plurality of idle pins are reserved on the serial port of a dual-mode mobile phone. Therefore, an idle pin can be selected, and the selected idle pin can be connected to a signal input port of the main chip. During communication, the dual-mode mobile phone and the PC are connected by a download line, and a pin is also set on the corresponding position of the download line and the idle pin selected above, and the pin is grounded or connected to a high level. When the download line is inserted into the serial port, through the contact of the two pins, the level of the signal input port of the main chip can be changed from the origin...
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