write_u8_inc(&wrptr, clockselect.fraction - 1);
write_u16be_inc(&wrptr, clockselect.disabled_channels);
count = wrptr - clock_bytes;
write_u8_inc(&wrptr, clockselect.fraction - 1);
write_u16be_inc(&wrptr, clockselect.disabled_channels);
count = wrptr - clock_bytes;