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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
www.ti.com
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 Section 6.10 .
6.13 Direct Commands from MCU to Reader
6.13.1 Command Codes
Table 6-19. Address and Command Word Bit Distribution
Command Code
0x00
0x03
0x04
0x05
0x06
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
Command
Idle
Software Initialization
Perform RF Collision Avoidance
Perform response RF Collision Avoidance
Perform response RF Collision Avoidance (n = 0)
Reset
Transmission without CRC
Transmission with CRC
Delayed Transmission without CRC
Delayed Transmission with CRC
End of Frame/Transmit Next Time Slot
Close Slot Sequence
Block Receiver
Enable Receiver
Test internal RF (RSSI at RX input with TX off)
Test external RF (RSSI at RX input with TX on)
Receiver Gain Adjust
Comments
Same as Power on Reset
ISO15693
The command code values from Table 6-19 are substituted in Table 6-20 , Bits 0 through 4. Also, the
most-significant bit (MSB) in Table 6-20 must be set to 1. ( Table 6-20 is same as Table 6-11 , shown here
again for user clarity).
Table 6-20. Address and Command Word Bit Distribution
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Description
Command control bit
Read/Write
Continuous address mode
Address/Command bit 4
Address/Command bit 3
Address/Command bit 2
Address/Command bit 1
Address/Command bit 0
Bit Function
0 = address
1 = command
0 = write
1 = read
1 = Continuous mode
Address
0
R/W
R/W
Adr 4
Adr 3
Adr 2
Adr 1
Adr 0
Command
1
0
0
Cmd 4
Cmd 3
Cmd 2
Cmd 1
Cmd 0
50
Detailed Description
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