RX95HF datasheet(11/44 Pages) STMICROELECTRONICS

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RX95HF

Communication protocols

4.1

Serial peripheral interface (SPI)

4.1.1

Polling mode

In order to send commands and receive replies, the application software has to perform 3

steps.

Send the command to the RX95HF.

Poll the RX95HF until it is ready to transmit the response.

Read the response.

The application software should never read data from the RX95HF without being sure that

the RX95HF is ready to send the response.

The maximum allowed SPI communication speed is fSCK.

A Control byte is used to specify a communication type and direction:



0x00: Send command to the RX95HF



0x03: Poll the RX95HF



0x02: Read data from the RX95HF



0x01: Reset the RX95HF

The SPI_SS line is used to select a device on the common SPI bus. The SPI_SS pin is

active low.

When the SPI_SS line is inactive, all data sent by the Master device is ignored and the

MISO line remains in High Impedance state.

Figure 6. Sending command to RX95HF

Figure 7. Polling the RX95HF until it is ready

MOSI

00000000

CMD

LEN

DATA

Control Byte

MISO

XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX

Several data bytes

MOSI

00000011

XXXXXX11

Control Byte

MISO

XXXXXXXX

Flag

Flags are polled until data is ready (Bit 3 is set when data is ready)

00000XXX

00001XXX

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