>I intend to use the same sort of circuit to convert between
>3.3V and 5V (MOSI from the MMC to the PIC), except the 3V3
>line will be connected to 5V

Phil
Check out the circuit that Philips recommend for doing I2C 5V to 3V
conversion. IIRC it uses one FET on each line.

http://www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
for the I2C spec document.

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