Frequency Synthesizer using SPI

After the partial sucess on the 200 channel synthesizer list above I became a bit adventerous and gone ahead developing a PLL synthesizer using MC145158 and same other components (circuit diagram). The reason being experimenting with the SPI family of PLLs by Motorola. So far the project is compelete and only the VCO part of the same has been checked. I am not to familiar with the SPI protocol and I am looking out for some help from other who can help me in programming the PLL using commonly available Microprocessor like AT89C2051 or the PIC 16C84. Figure 1 is that of the main PLL and the Loop filter, Figure 2 is that of the VCO and buffer amplifier and lastly figure 3 is a snapshot of the prototype.

Fig 1.

Fig 2