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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
The MSB determines if the word is to be used as a command or address. The last two columns of
Table 6-20 show the function of each bit, depending on whether address or command is written.
Command mode is used to enter a command resulting in reader action (initialize transmission, enable
reader, and turn reader on or off).
6.13.1.1 Idle (0x00)
This command issues dummy clock cycles. In parallel mode, one cycle is issued. In SPI mode, eight
cycles are issued.
6.13.1.2 Software Initialization (0x03)
This command starts a Power on Reset. After sending this command, the register values change as
shown in Table 6-21 .
Table 6-21. Register Values After Sending Software
Initialization (0x03)
Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x18
0x19
0x1A
0x1B
0x1C
Register
Chip Status Control
ISO Control
ISO14443B TX options
ISO14443A high bit rate options
TX timer setting, H-byte
TX timer setting, L-byte
TX pulse-length control
RX no response wait
RX wait time
Modulator and SYS_CLK control
RX Special Setting
Regulator and I/O control
IRQ status
Collision position and interrupt mask
Collision position
RSSI levels and oscillator status
Special Function
Special Function
RAM
RAM
Adjustable FIFO IRQ Levels
Reserved
NFC Low Field Detection Level
NFC Target Detection Level
NFC Target Protocol
Test
Test
FIFO status
Value
0x01
0x21 (1)
0x00
0x00
0xC1 (1)
0xC1 (1)
0x00
0x0E
0x07 (1)
0x91
0x10 (1)
0x87
0x00
0x3E
0x00
0x40
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
(1)
Differs from default at POR
Copyright ? 2011–2014, Texas Instruments Incorporated
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