Holtek BC45B4523, Manual, Page: 29 / 96

Rev. 1.20 29 October 28, 2020
BC45B4523
Sector 0 – Page 4: RF-Timing, Channel Redundancy and ADC Control
• Reserved Register
This register is reserved for internal settings.
Address Bit 7 6 5 4 3 2 1 0
0x20
Name Reserved
Type R/W
Reset Value 0 0 0 0 1 0 1 0
Bit 7~0 Reserved bits for internal settings. For proper operation, the register content must be fixed at
“0000_1010” and can not be modified
• RxWait Register
This register is used to define the guard time from TX EOF to the start of receiving the timing for the receiver.
Address Bit 7 6 5 4 3 2 1 0
0x21
Name RxWait[7:0]
Type R/W
Reset Value 0 0 0 0 0 1 1 0
Bit 7~0 RxWait[7:0] :
The RxWait defines the guard time between the TX EOF and the start of receiving of the decoder in
the unit of one-bit duration. This will increase receiving capability especially in noisy environment.
The one-bit duration unit is defined from SubCPulses and SubCCarrier in the RxControl1 register. For
example, in ISO14443A @ 106kbps, the RxWait should be set to 0x06.
• ChannelRedundancy Register
This register is used to setup the CRC and Parity check for receiving data.
Address Bit 7 6 5 4 3 2 1 0
0x22
Name — MSBFirst CRC3309 CRC8 RxCRCEn TxCRCEn ParityOdd ParityEn
Type — R/W R/W R/W R/W R/W R/W R/W
Reset Value — 0 0 0 0 0 1 1
Bit 7 Unimplemented, read as “0”
Bit 6 MSBFirst :
If this bit is set to 1, the MSB bit in data frame will be the first bit used for CRC calculation.
Bit 5 CRC3309 :
If this bit is set to 1, the CRC-calculation will be executed according to ISO/IEC3309 for ISO14443B
and ISO15693.
Bit 4 CRC8 :
0: 16-bit CRC is calculated
1: 8-bit CRC is calculated
Bit 3 RxCRCEn :
0: No CRC is expected at the end of the received frame
1: The last byte of the received frame is interpreted as the CRC byte
Bit 2 TxCRCEn :
0: No CRC is appended and transmitted
1: The CRC is calculated for the transmitted frame and appended to the end of the transmitted data
Bit 1 ParityOdd :
0: Even parity is calculated and compared with the received frame
1: Odd parity is calculated and compared with the received frame