Rev. 1.20
21
October 28, 2020
BC45B4523
• CRCResultMSB Register
This register contains the CRC result.
Address
Bit
7
6
5
4
3
2
1
0
0x0E
Name
CRCResultMSB[7:0]
Type
R
Reset Value
0
1
1
0
0
0
1
1
Bit 7~0
CRCResultMSB[7:0]
: The most significant byte of the CRC result
The value of this register is valid only if the CRCReady bit is set to 1.
• BitFraming Register
This register is used to control the bit framing input/output for transmission/reception of the bit-oriented frame.
Address
Bit
7
6
5
4
3
2
1
0
0x0F
Name
—
RxAlign[2:0]
—
TxLastBits[2:0]
Type
—
DY
—
DY
Reset Value
—
0
0
0
—
0
0
0
Bit 7
Unimplemented, read as “0”
Bit 6~4
RxAlign[2:0]
: Define the first received bit position in the first received byte
RxAlign is used to define the position of the first received data bit to be stored in the first received
byte in the bit oriented frame in ISO14443A. RxAlign is automatically cleared after the reception has
finished in Transceive and Receive commands.
Bit 3
Unimplemented, read as “0”
Bit 2~0
TxLastBits[2:0]
: Define the number of bits of the last byte to be transmitted
TxLastBits is used to define the number of bits of the last byte to be transmitted in the bit oriented
frame in ISO14443A. The value “000” is used to define the whole last byte that will be transmitted.
This bit field is automatically cleared after the transmission has finised in Transceive and Transmit
commands.
Sector 0 – Page 2: TX and Coder
• TxControl Register
This register is used to control the logical behaviour of the transmitter driver on pin TX1 and TX2.
Address
Bit
7
6
5
4
3
2
1
0
0x11
Name
Tx1Inv
ModulatorSource[1:0] 100ASK
Tx2Inv
Tx2Cw Tx2RFEn Tx1RFEn
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
0
0
0
1
1
0
0
0
Bit 7
Tx1Inv
:
If this bit is set to 1, TX1 will deliver an inverted 13.56MHz carrier.
Bit 6~5
ModulatorSource[1:0]
: Select source for Coder input
00: Tri-state
01: High
10: Internal Coder
11: Pin TD
Bit 4
100ASK
:
Setting this bit to 1 forces a 100% ASK Modulation, independent from the TxCfgMod value in the
register 0x13.
For ISO14443A and ISO15693 (100% modulation index), this bit should be set to 1.