Bit Angle Modulation (BAM) in a PIC

[RadikalQ3]

You can invert the value of the bits in each cycle.

In odd cycles, do first the normal order retard for each bit:
1,2,4,8,16,32,64,128

and, in the even cycles, reverse the value of each bit:
128,64,32,16,8,4,2,1

Edit:
Oops this can generate the problem even without transtitions of the dutty cycle used... hummm... maybe rearranging the value of the bits, not just reversing them :?