ST95HF NFC/RFID收发器详细规格

ST95HF

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DocID025630 Rev 4 15/93

ST95HF Communication protocols

4 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.

1. Send the command to the ST95HF.

2. Poll the ST95HF until it is ready to transmit the response.

3. Read the response.

The application software should never read data from the ST95HF without being sure that

the ST95HF is ready to send the response.

The maximum allowed SPI communication speed is f

SCK

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

• 0x00: Send command to the ST95HF

• 0x03: Poll the ST95HF

• 0x02: Read data from the ST95HF

• 0x01: Reset the ST95HF

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.

In Slave mode, the phase and polarization are defined with CPOL = 1 and CPHA = 1 or

CPOL = 0 and CPHA = 0.

Figure 6. Sending command to ST95HF

Figure 7. Polling the ST95HF until it is ready

MOSI

0 0 0 0 0 0 0 0 CMD LEN DATA DATA

Control Byte

MISO

X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X

Several data bytes

MOSI

0 0 0 0 0 0 1 1 X X X X X X 1 1 X X X X X X 1 1 X X X X X X 1 1

Control Byte

MISO

X X X X X X X X

Flag Flag

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

0 0 0 0 0 X X X 0 0 0 0 0 X X X 0 0 0 0 1 X X X

Communication protocols ST95HF

16/93 DocID025630 Rev 4

Figure 8. Reading data from ST95HF

Data must be sampled at the rising edge of the SCK signal.

‘Sending’, ‘Polling’ and ‘Reading’ commands must be separated by a high level of the

SPI_SS line. For example, when the application needs to wait for data from the ST95HF, it

asserts the

SPI_SS line low and issues a ‘Polling’ command. Keeping the SPI_SS line low,

the Host can read the Flags Waiting bit which indicates that the ST95HF can be read. Then,

the application has to assert the

SPI_SS line high to finish the polling command. The Host

asserts the

SPI_SS line low and issues a ‘Reading’ command to read data. When all data is

read, the application asserts the

SPI_SS line high.

The application is not obliged to keep reading Flags using the Polling command until the

ST95HF is ready in one command. It can issue as many 'Polling' commands as necessary.

For example, the application asserts

SPI_SS low, issues 'Polling' commands and reads

Flags. If the ST95HF is not ready, the application can assert

SPI_SS high and continue its

algorithm (measuring temperature, communication with something else). Then, the

application can assert

SPI_SS low again and again issue 'Polling' commands, and so on, as

many times as necessary, until the ST95HF is ready.

Note that at the beginning of communication, the application does not need to check flags to

start transmission. The ST95HF is assumed to be ready to receive a command from the

application.

Figure 9. Reset the ST95HF

To reset the ST95HF using the SPI, the application sends the SPI Reset command (Control

Byte 01, see

Figure 9) which starts the internal controller reset process and puts the

ST95HF into Power-up state. The ST95HF will wake up when pin IRQ_IN goes low. The

ST95HF reset process only starts when the

SPI_SS pin returns to high level.

Table 5. Interpretation of flags

Bit Meaning (application point of view)

[7:4] Not significant

3 Data can be read from the ST95HF when set.

2 Data can be sent to the ST95HF when set.

[1:0] Not significant

MOSI

0 0 0 0 0 0 1 0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X

Control Byte

MISO

X X X X X X X X Resp Code LEN DATA DATA

Several data bytes

MOSI

0 0 0 0 0 0 0 1

Control Byte 01

MISO

X X X X X X X X

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