Texas Instruments TRF7970A Manual page 41

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Figure 6-21. Continuous Read of Registers 0x00 to 0x05 Using SPI With SS
Figure 6-22 shows an example of performing a single slot inventory command. Reader registers (in this example)
Figure 6-22. Inventory Command Sent From MCU to TRF7970A
The TRF7970A takes these bytes from the MCU and then send out Request Flags, Inventory Command,
and Mask over the air to the ISO/IEC 15693 transponder. After these three bytes have been transmitted,
an interrupt occurs to indicate back to the reader that the transmission has been completed. In the
example in Figure
Inventory command is sent out.
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are configured for 5 VDC in and default operation.
6-23, this IRQ occurs approximately 1.6 ms after the SS line goes high after the
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SLOS743L – AUGUST 2011 – REVISED MARCH 2017
TRF7970A
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Detailed Description 41