I tried to configured RF gain (register address: 6316h) to the highest gain i.e. 48dB, by setting the register value to 0x78, but on reading the same register(CIU_RFCFG)immediately after writing the value was 0x78, after sending some other command and reading the (CIU_RFCFG) register again it was default value i.e. 0x59. How to write and save the register value of RF configuration register? and what might be the maximum gain we can set for PN532C1?