Yes, the 2550 and 4550 will run on 3.3 volt. See the link in post #4.
Use a 4MHz external OSC and the chip can be PLL'ed to 48 MHz if needed. The electrical section of the data sheet shows what can be done.
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Re: SD card library?
Yes, the 2550 and 4550 will run on 3.3 volt. See the link in post #4.
Use a 4MHz external OSC and the chip can be PLL'ed to 48 MHz if needed. The electrical section of the data sheet shows what can be done.
Dave
Always wear safety glasses while programming.
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