Those look like PIC by Microchip. Email Microchip and ask.Have not found in datasheet how many i can connect.
all mcu will be around 15 cm from master, on same PCB,.
speed is not that importain, so i think baud at 300 should do it.
Someone must be able to say if it Works, cant be that i am the only one that planed to do so.
+1 As it is shown, the PIC UART output will drive all of those inputs but PB's point is important. If these are all closely located it should be OK but if the slaves are connected by lengths of cable you may run into trouble with noise, ground offsets etc. 300 baud removes some of the cable issues but not all. The IO ports are not really line drivers.In your case you need to be concerned with the ability of your one output to drive a capacitative load at the baudrate you intend to use. Are all the processors on one board in close proximity or are they spread out on a factory floor. These details make a huge difference.
I can not answer the question but most of the pic's output pin's can handle 10mA.
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by Jake Hertz
by Jake Hertz