Questions about microcontrollers

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Questions about microcontrollers [Copy link]

I would like to ask what is the purpose of connecting 27 and 25 here?

lcofjp

It's useless, maybe it's drawn wrong. In addition, you need to refer to the comprehensive peripheral circuit to guess.

sint27

Similar to watchdog function?

For example, if one of the ports outputs a specific pulse, and the other port is used as input to verify in the interrupt, then it will be reset if the reception is incorrect?

maychang

sint27 posted on 2020-7-30 09:36 Similar to the watchdog function? For example, one port outputs a specific pulse, and the other port is used as input to verify in the interrupt. If the reception is incorrect, it will be reset?

This is unlikely.

If a pin does not send a specific pulse signal because the program is out of order, then the program that reads another pin will probably not be executed, even in an interrupt. Moreover, if a pin is required to send a specific pulse signal continuously, how much time will be left for the main program? The interrupt program needs to check whether a specific pulse signal is received, and the interrupt program will definitely take a long time, leaving no time for the main program to execute.

chunyang

There are network labels in the diagram, which obviously means there are external circuit connections. It is meaningless to analyze the local part without the external circuit. Let's complete the diagram first.

Num1

Your picture is incomplete, it's hard to see other functions clearly.