i been working on a design based on mcf51jm128. i added dual power supply, so the microcontroller can be powered with 5v and 3.3v. also, there're some peripherals like MicroSD (3.3v), CAN transceiver and RS845 transceiver. (5v).
i was wondering if JM128 pins are 5v tolerant, so i can use CAN and 485 modules with 3.3v on ucontroller safetly.
it could be possible to use a series resistor between both devices without burning peripherals or microcontroller?
the schematic is still on process, so there're missing parts and things to change