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Regarding Renesas part number R5F100LEAFB#V0: I have its data lines and control lines tied to an LCD (operating at 5V). The R5F100LEAFB#V0 has EVDD at 3.3 V. Will the R5F100LEAFB#V0 be damaged due to the voltage mis-match to the LCD (3.3V vs. 5V)?
Your ports all have switchable open drain outputs.... Therefore switch to open drain.. Fit a bussed resistor to 5v.. And it will work.
The pic32 have this.. It makes the ports 5v tolerant whilst you can still use it with 3v devices... Just ensure the ports are switched ( I think they are selected by default, but your datasheet will confirm this )
If all the lines going to the LCD are output only should he be fine? The only risk is 5V being applied to pins of the 3.3V device. Is he doing that? Almost nobody reads anything from a standard 2-line LCD.
So long as he keeps the R/W pin on the LCD at 0V (write only) he should be fine as far as levels go. However, I've attempted to drive a 5V LCD from a 3.3V device. Didn't work too well on its own because the display perceived 70% Vcc as logic 1 and the 3.3V device fell just under that. So in the end I ended up having to use a logic level translator circuit between the two.