I have a board that uses a S12XE controller and the power supply is 5V.
It has also an atmel flash memory that works at 3.3V
I have to redesign and simplify the board.
Since to board has already power supply of 3.3V, I am thinking of making S12XE controller to work at 3.3V.
The only problem I have is that the specification gives as minimum voltage of VDDR, VDDA 3.13 that is very close to 3.3V (the difference is only 170mV). For the reset I am going to use LM37XX that keeps uC to reset at the voltage of 3.14V
I would like to ask if anyone have already used any HCS controller at 3.3V and if he believe that is save to used power supply so close to minimum voltage.