TRF7963ARHBR Datasheet, PDF(38/63 Page) Texas Instruments – FULLY INTEGRATED 13.56-MHz RFID EADER/WRITER FOR ISO14443A,B/NFC STANDARDS

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TRF7963ARHBR Datasheet, PDF (38/63 Pages) Texas Instruments – FULLY INTEGRATED 13.56-MHz RFID EADER/WRITER FOR ISO14443A,B/NFC STANDARDS

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TRF7963A

SLOS758C â DECEMBER 2011 â REVISED JANUARY 2013

5.13 Direct Commands from MCU to Reader

5.13.1 Command Codes

Table 5-11 lists the valid commands that the MCU can send to the reader.

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Command

Code

0x00

0x03

0x0F

0x10

0x11

0x16

0x17

0x18

0x19

0x1A

Table 5-11. Command Codes

Command

Idle

Software Initialization

Reset

Transmission without CRC

Transmission with CRC

Block Receiver

Enable Receiver

Test external RF (RSSI at RX input with TX on)

Test internal RF (RSSI at RX input with TX off)

Receiver Gain Adjust

Comments

Same as power on reset

The command code values from Table 5-11 are substituted in Table 5-12, Bits 0 through 4. Also, the

most-significant bit (MSB) in Table 5-12 must be set to 1.

Table 5-12. Address/Command Word Bit Distribution

Bit

Description

Bit Function

Address

Command

Command control bit

0 = address

1 = command

Read/Write

0 = write

1 = read

R/W

Continuous address mode

Continuous

mode

Not used

Address/Command bit 4

Adr 4

Cmd 4

Address/Command bit 3

Adr 3

Cmd 3

Address/Command bit 2

Adr 2

Cmd 2

Address/Command bit 1

Adr 1

Cmd 1

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 5-12 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).

5.13.2 Reset (0x0F)

The reset command clears the FIFO contents and FIFO Status register (0x1C). It also clears the register

storing the collision error location (0x0E).

5.13.3 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.

Detailed System Description

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