> Yes there is a PIC somewhere
Isn't "PIC" a trade name of Microchip Technology Inc.?
Zhen Hua transmitters are based on different (Samsung?) microchip.

> ...I mean the E-sky and the Walkera both using the Zhen Hua Protokoll
Zhen Hua protocol, if such thing exists, has nothing to do with these transmitters. AFAIK, all the transmitters made by Zhen Hua implement a usual PPM protocol. The only problem is that transmitters with "CCPM" in their title have CCPM mix, which cannot be disabled (while all "serious" major brand transmitters let you switch CCPM off), thus, Zhen Hua transmitter cannot be used with regular PPM-to-PC interfaces without modifications. Even though the signal will probably be successfully converted to one of the computer readable forms (FMS serial protocol, USB joystick data, etc.), this signal will be already mixed--movement of the throttle stick will cause the change in several channel signals. None of the simulators I know can work with such mixed signal.

AFAIK, Zhen Hua protocol refers to the serial port exchange protocol implemented in Zhen Hua serial cable sold for some of their CCPM transmitters. I have ESky "Channels Six" transmitter, which can work with this serial cable and software (PPjoy) supporting Zhen Hua protocol. But, again, this has nothing to do with the transmitter itself! Zhen Hua serial cable is based on some Atmel chip and has surprisingly (or, should I say, unnecessarily?) many components. Most likely, the chip un-mixes the CCPM signal and feeds the original channel signals to the PC.

The strange thing is why Zhen Hua decided to use a proprietary protocol instead of sticking to a regular and widely supported FMS serial protocol... For example, CCPM interface from MileHighWings.com implements such an un-mixing but uses FMS serial protocol, which makes it possible to use a CCPM transmitter with FMS/CockpitMaster/RC Plane Master without any intermediate drivers.