Texas Instruments TRF7970A Instruction Manual page 52

TRF7970A
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.
52 Detailed Description
Table 6-21. Register Values After Sending Software
Initialization (0x03)
Address
0x00 Chip Status Control
0x01 ISO Control
0x02 ISO14443B TX options
0x03 ISO14443A high bit rate options
0x04 TX timer setting, H-byte
0x05 TX timer setting, L-byte
0x06 TX pulse-length control
0x07 RX no response wait
0x08 RX wait time
0x09 Modulator and SYS_CLK control
0x0A RX Special Setting
0x0B Regulator and I/O control
0x0C IRQ status
0x0D Collision position and interrupt mask
0x0E Collision position
0x0F RSSI levels and oscillator status
0x10 Special Function
0x11 Special Function
0x12 RAM
0x13 RAM
0x14 Adjustable FIFO IRQ Levels
0x15 Reserved
0x16 NFC Low Field Detection Level
0x18 NFC Target Detection Level
0x19 NFC Target Protocol
0x1A Test
0x1B Test
0x1C FIFO status
(1) Differs from default at POR
Submit Documentation Feedback
Product Folder Links:
Register Value
0x01
0x21
0x00
0x00
0xC1
0xC1
0x00
0x0E
0x07
0x91
0x10
0x87
0x00
0x3E
0x00
0x40
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Copyright © 2011–2014, Texas Instruments Incorporated
TRF7970A
www.ti.com
(1)
(1)
(1)
(1)
(1)