In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

Tracy,

I don't have a problem with using the entire 8-bit port to bit-bang a sine wave via a R2R dac, but I don't gain any more
CPU time doing it that way vs with the 2-pin method I mentioned above.  I think even a triangle wave would work using the
two pin method with a 90 Deg phase lag.

[code]
A  B    Sine Phase
0  1       0 Deg
0  0      90 Deg
1  0     180 Deg
1  1     270 Deg
[\code]

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