Texas Instruments TRF7963A, Manual

Page: 39 / 73

39
TRF7963A
www.ti.com SLOS758G – DECEMBER 2011 – REVISED MARCH 2020
Submit Documentation Feedback
Product Folder Links: TRF7963A
Detailed Description
Copyright © 2011–2020, Texas Instruments Incorporated
6.13 Direct Commands from MCU to Reader
6.13.1 Command Codes
Table 6-11 lists the valid commands that the MCU can send to the reader.
Table 6-11. Command Codes
COMMAND
CODE
COMMAND COMMENTS
0x00 Idle
0x03 Software Initialization Same as power-on reset
0x0F Reset FIFO
0x10 Transmission Without CRC
0x11 Transmission With CRC
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 off
0x1A Receiver Gain Adjust
The command code values from Table 6-11 are substituted in Table 6-12 , Bits 0 to 4. Also, the most
significant bit (MSB) in Table 6-12 must be set to 1.
Table 6-12. Address/Command Word Bit Distribution
BIT DESCRIPTION BIT FUNCTION ADDRESS COMMAND
B7 Command control bit
0 = Address
1 = Command
0 1
B6 Read/Write
0 = Write
1 = Read
R/W 0
B5 Continuous address mode
Continuous
mode
Not used
B4 Address/Command bit 4 Adr 4 Cmd 4
B3 Address/Command bit 3 Adr 3 Cmd 3
B2 Address/Command bit 2 Adr 2 Cmd 2
B1 Address/Command bit 1 Adr 1 Cmd 1
B0 Address/Command bit 0 Adr 0 Cmd 0
The MSB determines if the word is to be used as a command or address. The last two columns of
Table 6-12 show the function of separate bits depending on whether address or command is written.
Command mode is used to enter a command resulting in reader action (for example, initialize
transmission, enable reader, or turn the reader on or off).
6.13.2 Reset FIFO (0x0F)
The reset command clears the FIFO contents and FIFO Status register (0x1C). It also clears the register
storing the collision error location (0x0E).
6.13.3 Transmission With CRC (0x11)
The transmission command must be sent first, followed by transmission length bytes, and FIFO data. The
reader starts transmitting after the first byte is loaded into the FIFO. The CRC byte is included in the
transmitted sequence.