Yes... I'm just saying you can try Manchester coding for on air transmition... I had in mind that this IC has a complex instruction set....
sorry but no.
Manchester Encoding is used to address a completely different set of problems.
if you have a transmission system with an unknown reference level Manchester Encoding is a good choice.
for example with the long cable lengths involved in 10BT ethernet the reference voltage (0V) can vary quite a lot between devices.
because Manchester Encoding looks at the changes in voltage rather than the set level of a voltage it can handle the unknown reference voltage.
Manchester Encoding is sometimes required on more old fashioned RF systems but usually it is handled behind the scenes on all the newer ones. (i doubt if there was ever a transceiver system that required you to implement it your self.
the RFM12 already does all encoding for you in the background using FSK. http://en.wikipedia.org/wiki/Frequency-shift_keying
implementing your own Manchester Encoding as well would just cut your bandwidth in half.