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what is HW and SW? anyway ill be using 8051 microdrbizzarow said:what kind of multiplexing you need ?? HW or SW ???
like through SW you can use any PIC IO port as serial port ..... but 1 at a time
external? what do you mean by that? i was thinking og multiplesing my UART or maybe tru 232 signal. im asking if this is efficient.MAK-1 said:For multiple HW RS232 multiplexing use external multiplexer.
i think its not a good applicationamol_shah said:use bit banging technique
https://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Bit-Banging.html
and its by software....maybe it would be easy if ill let the hardware do it/this is quite a tedious process and puts too much load the Micro controller processing.
didnt get your point..about RS232..?? im thinking of MAX232, it just convert the TTL to RS232 signal.laktronics said:Hi,
If your Micro has sufficient idle time bit banging can be used. Otherwise you have to interface UART Chips along with RS232 drivers.
Regards,
Laktronics
yah as i mention earlier..but did you try using it?(theoriticaly it will work)penoy_balut said:a single uart can be up to 16 by using mux/demux like CD4067, additional pins are required for addressing
i think your making it complicated..pls explaindavidgrm said:Software UART can be done on 8051. In fact the boolean processor makes this very efficient. The other alternative is to use a multi drop network such as rs485
can you show me the application note?davidgrm said:Not sure which of my two suggestions is making it more complicated. You have not stated exactly what you are trying to achieve. If you just want to communicate between a lot of micro's you can use rs485. This will allow distances of over a kilometre. You can connect many systems together on an rs485 network and it is fairly simple to use.
My comment about the 8051 was just in response to drbizzarow's comment regarding 8051. The 8051 has a hardware uart and can support quite a few soft uarts. Atmel have an app note which has 8 soft uarts plus a hardware uart all working simultaneously at 9600 baud.