Holtek BC45B4523, Руководство пользователя, Страница: 22 / 96

Rev. 1.20 22 October 28, 2020
BC45B4523
Bit 3 Tx2Inv :
If this bit is set to 1, TX2 will deliver an inverted 13.56MHz carrier.
Bit 2 Tx2Cw :
0: TX2 delivers a modulated 13.56MHz carrier
1: TX2 continuously delivers an un-modulated 13.56MHz carrier
Bit 1 Tx2RFEn :
0: TX2 drives a constant following Tx2Inv
1: TX2 delivers a 13.56MHz carrier
Bit 0 Tx1RFEn :
0: TX1 drives a constant following Tx1Inv
1: TX1 delivers a 13.56MHz carrier
• TxCfgCW Register
This register is used to configure TX1 and TX2 output conductance in the un-modulation state.
Address Bit 7 6 5 4 3 2 1 0
0x12
Name — — TxCfgCW[5:0]
Type — — R/W
Reset Value — — 1 1 1 1 1 1
Bit 7~6 Unimplemented, read as “0”
Bit 5~0
TxCfgCW[5:0] : Define TX1 and TX2 output conductance in the un-modulation state
• TxCfgMod Register
This register is used to configure TX1 and TX2 output conductance in the modulation state.
Address Bit 7 6 5 4 3 2 1 0
0x13
Name — — TxCfgMod
Type — — R/W
Reset Value — — 0 1 0 0 0 0
Bit 7~6 Unimplemented, read as “0”
Bit 5~0
TxCfgMod[5:0]
: Define TX1 and TX2 output conductance in the modulation state
This bit field is used to regulate the output power during the modulation state (low level field of ENV).
If the 100ASK bit is set to 1, the value of TxCfgMod will have no effect.
• CoderControl Register
This register is used to set the coder rate and the coding mode.
Address Bit 7 6 5 4 3 2 1 0
0x14
Name Send1Pulse — CoderRate[2:0] TxCoding[2:0]
Type R/W — R/W R/W
Reset Value 0 — 0 1 1 0 0 1
Bit 7 Send1Pulse :
Setting this bit to 1 forces a generation of the only one modulation pulse to switch to the next TimeSlot
in conjunction with an Inventory command in ISO15693. As this bit is not cleared automatically, it has
to be reset to 0 manualy.
Bit 6 Unimplemented, read as “0”