Direct Commands From Mcu To Reader - Texas Instruments TRF7970A Instruction Manual
Multiprotocol fully integrated 13.56-mhz rfid and near field communication
(nfc) transceiver ic
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Also See for TRF7970A:
- Getting started manual (23 pages) ,
- User manual (51 pages) ,
- Manual (91 pages)
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6.12.2 Initiator
The chip is fully controlled by the MCU as in RFID reader operation. The MCU activates the chip and
writes the mode selection in the ISO Control register. The MCU uses RF collision avoidance commands,
so it is relieved of any real-time task. The normal transmit and receive procedure (through the FIFO) are
used to communicate with the TARGET device as described in
6.13 Direct Commands from MCU to Reader
6.13.1 Command Codes
Command Code
0x00
Idle
0x03
Software Initialization
0x04
Perform RF Collision Avoidance
0x05
Perform response RF Collision Avoidance
0x06
Perform response RF Collision Avoidance (n = 0)
0x0F
Reset
0x10
Transmission without CRC
0x11
Transmission with CRC
0x12
Delayed Transmission without CRC
0x13
Delayed Transmission with CRC
0x14
End of Frame/Transmit Next Time Slot
0x15
Close Slot Sequence
0x16
Block Receiver
0x17
Enable Receiver
0x18
Test internal RF (RSSI at RX input with TX off)
0x19
Test external RF (RSSI at RX input with TX on)
0x1A
Receiver Gain Adjust
The command code values from
most-significant bit (MSB) in
again for user clarity).
Bit
B7
B6
B5
Continuous address mode
B4
Address/Command bit 4
B3
Address/Command bit 3
B2
Address/Command bit 2
B1
Address/Command bit 1
B0
Address/Command bit 0
Copyright © 2011–2014, Texas Instruments Incorporated
Table 6-19. Address and Command Word Bit Distribution
Command
Table 6-19
Table 6-20
must be set to 1. (
Table 6-20. Address and Command Word Bit Distribution
Description
Command control bit
Read/Write
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SLOS743K – AUGUST 2011 – REVISED APRIL 2014
Section
6.10.
Same as Power on Reset
ISO15693
are substituted in
Table
Table 6-20
is same as
Bit Function
0 = address
1 = command
0 = write
1 = read
1 = Continuous mode
TRF7970A
TRF7970A
Comments
6-20, Bits 0 through 4. Also, the
Table
6-11, shown here
Address
Command
0
R/W
R/W
Adr 4
Cmd 4
Adr 3
Cmd 3
Adr 2
Cmd 2
Adr 1
Cmd 1
Adr 0
Cmd 0
Detailed Description
1
0
0
51
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