STB6100_NF_LSB
nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
regs[STB6100_NF_LSB] = nfrac;
rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
[STB6100_NF_LSB] = "NF",
[STB6100_NF_LSB] = { 0xff, 0x00 },