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

Anyone have some clever code to generate a pseudo sine wave?
Eventually this will be implemented in a frequency sweep application for doing Bode plots.

(Bean, your audio generation project gave me an ide for this.) 

Right now I have a scheme that requires two I/O pins that are "flipped" at the same time, 
with one lagging the other by 60 Deg.

[code]
        1K
A >----/\/\----o
               |
               0----> Out
        1K     |  
B >----/\/\----o

A  B   SinePhase
0  1       0
0  0      60
0  0     120
1  0     180
1  1     240
1  1     300
[/code]

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