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"The most frequently asked question about this controler is the voltage level adaptation. The controller operates at 3.3V and the PIC on the board operates at 5.0V.
So, the question is : how to adapt ENC voltage levels to PIC voltage level ?
We must consider both sides :
PIC output voltage for logical 1 is 5V : does ENC accepts 5V on its inputs, whereas it is 3.3V powered ?
The answer is yes, ENC inputs are 5V compliant, so that there is no risk for the controller to apply 5V on its inputs, and they will correspond to logical 1.
ENC output voltage for logical 1 is 3.3V : will the inputs of the PIC turn high or low when 3.3V coming from the ENC outputs is applied ?
The answer is : it depends on the inputs of the PIC. TTL inputs give logical 1 above 2.05V, and will not require voltage level shifting. Schmitt trigger inputs give logical 1 above 3.5V, and will require voltage level shifting.
In fact, we can consider that if we connect ENC outputs to PIC TTL inputs only, the voltage level adapter is... a wire.
Most of PICs have TTL inputs and integrated SPI on PORTC, so we will connect all ENC line to this port."
well, thanks for all instructions. I have built a ENC board without any 74 series but I will try how it behaviours to the PIC. And, I also use another PIC (maybe 18F4550).
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