SLOA140B April   2009  – November 2018 TRF7960 , TRF7960A , TRF7961 , TRF7962A , TRF7963A

 

  1.   Using the SPI Interface With TRF7960
    1.     Trademarks
    2. 1 TRF7960 - SPI With SS* Mode Errata
      1. 1.1 SCLK Polarity Switch
      2. 1.2 IRQ Status Register Read
      3. 1.3 Direct Command Processing
      4. 1.4 Initialization of Derivative Registers
      5. 1.5 Transmitting One Byte Through the FIFO
      6. 1.6 Extra Dummy Bytes on RX
      7. 1.7 Timing Conditions for MOSI With Respect to S_CLK
  2.   Revision History

1.4 Initialization of Derivative Registers

Some of the registers (RX wait time, RX no response wait time) do not take default values when the Tag-it™ protocol is chosen in the ISO control register. This is solved by manually programming the timing related registers in the Initialization routine as shown in the pseudo code of the TIInventoryRequest function below.

code3_loa140.gif

It is also recommended that the modulator and system clock register (register 0x09) be re-initialized when the inventory request (15693) or REQB (14443B) or REQA (14443A) is issued.