The function of UART is realized by using the c8051 microcontroller JTAG interface 10

This single-chip microcomputer was used when we were in school, and it was a board drawn by ourselves at that time, so it led to the UART interface. JTAG can realize the function of serial port?? Isn't that equivalent to using the IO port to simulate the serial port, but is it necessary, will the serial port baud rate be high?

I don't know, I shouldn't be able to, or how not to use a serial port instead of JTAG. Also,I feel that 020 has no special benefits except for more io ports.,It's more comfortable to use.,And at that time**It wasn't cheap.,It's about 30 yuan a piece.。 Why don't you use a low-priced arm, we use ARM now, here is a ** recommended to you:

The ARM of the LPC1100 series is affordable. Hehe.

Also, if the landlord finds a way to replace UART with JTAG, please tell me to satisfy my curiosity. Thanks, hehe.

If JTAG can scan the data in registers and RAM, and modify the data, then there may be a way to process JTAG's software on the computer and extract the data from it. Of course, this is the programming of the computer, not the programming of the microcontroller.

There are boards and interfaces on it! This is the serial interface of 51, and you can use the MAX232 to expand it to RS232, in fact, you can do a level conversion through the MAX232 to convert the 0 5V level to the +12V -12V of the RS232 protocol

You can try to use the ordinary io port to simulate the serial port, I know this scheme is feasible, I haven't done it specifically, you look for information on the Internet. Also, why does 8051 not have a serial port? A simpler way is to make an expansion board by yourself, take out the sum on the development board, add a MAX232 and 5 small capacitors, and then connect a serial mouth, isn't it possible to communicate with the host computer?

The 8051 microcontroller cannot be used for off-chip debugging.

JTAG is roughly divided into two categories, one is used to test the electrical characteristics of the chip, and detect whether there is a problem with the core or the reed; One is for debugging; Generally, CPUs that support JTAG contain these two modules.

A CPU with a JTAG DEBUG interface module, as long as the clock is normal, can access the internal registers of the CPU and the devices hanging on the CPU bus, such as FLASH, RAM, SOC (such as 4510B, 44box, AT91M series) The registers of the built-in module, such as UART, Timers, GPIO, etc., can be accessed through the JTAG interface.