User's Manual

Table Of Contents

TRF7960

TRF7961

SLOU186F–AUGUST 2006–REVISED AUGUST 2010

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5.4 Direct Commands From MCU to Reader

5.4.1 Command Codes

Table 5-29. Command Codes

Command Code (hex) Command Comments

00 Idle

03 Software Initialization Software initialization, same as power on reset

0F Reset

10 Transmission without CRC

11 Transmission with CRC

12 Delayed transmission without CRC

13 Delayed transmission with CRC

14 Transmit next time slot ISO15693, Tag-It

16 Block receiver

17 Enable receiver

18 Test internal RF (RSSI at RX input with TX ON)

19 Test external RF (RSSI at RX input with TX OFF)

1A Receiver gain adjust

Note: The command code values from Table 5-29 are substituted in Table 5-32, bit 0 through bit 4. Also,

the most-significant bit (MSB) in Table 5-31 must be set to 1.

5.4.2 Reset

The reset command clears the FIFO contents and FIFO status register (1Ch). It also clears the register

storing the collision error location (0Eh).

5.4.3 Transmission With CRC

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.

5.4.4 Transmission Without CRC

Same as Section 5.4.3 with CRC excluded.

5.4.5 Delayed Transmission With CRC

The transmission command must be sent first, followed by the transmission length bytes, and FIFO data.

The reader transmission is triggered by the TX timer.

5.4.6 Delayed Transmission Without CRC

Same as above with CRC excluded.

5.4.7 Transmission Next Slot

When this command is received, the reader transmits the next slot command. The next slot sign is defined

by the protocol selection.

5.4.8 Receiver Gain Adjust

This command should be executed when the MCU determines that no TAG response is coming and when

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