In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

I'm pretty sure that there are 3.3 Volt types of RS-485 drivers available - you should check the MAXIM web site.

Right, brownout does not save anything - it simply resets the controller, i.e. when the supply voltage rises again above the brownout level, the program will be executed again like after a power-on.

The question is if RS-485 would not be an "overkill" for applications like retrieving data from a roadside mailbox. I think the volume of data to be exchanged will be relatively low per information packet thus the serial data can be sent at a low rate (say 300 Baud). Then even RS-232 or serial TTL should work along a couple of kilometers.

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