Средства и методы разработки

так не пойдёт?

typedef union R4container
 {
  unsigned long data;
  unsigned char _8_bit_data_[4];
  struct
  {
   unsigned int select:3;
   unsigned int outPwr:2;
   unsigned int outEnable:1;
   unsigned int auxmodes:4;
   unsigned int muteTillLock:1;
   unsigned int VCOpowerdown:1;
   unsigned int bandSelClkVal:8;
   unsigned int RFdivSelect:3;
   unsigned int fedbackSel:1;
   unsigned int :8;
  }bits;
 }R4container;

...

R4container     _R4datareg;
...
_R4initMask_={.bits.RFdivSelect=0,.bits.auxmodes=0,.bits.VCOpowerdown=0,.bits.muteTillLock=0,
              .bits.bandSelClkVal=8,.bits.fedbackSel=1,
              .bits.outEnable=1,.bits.outPwr=3,.bits.select=4};
...
_R4datareg.data=_R4initMask_.data;
...
port0=_R4datareg._8_bit_data_[0];
port1=_R4datareg._8_bit_data_[1];
...