PCF_GET_S1
if ((PCF_GET_S1(pcf) & PIN) == 0)
noack = PCF_GET_S1(pcf) & LRB;
if ((PCF_GET_S1(pcf) & nBB) == 0)
status = PCF_GET_S1(pcf);
status = PCF_GET_S1(pcf);
} while ((PCF_GET_S1(pcf) & PIN) == 0);