ST25R3918 datasheet(46/142 Pages) STMICROELECTRONICS

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Application information

ST25R3918

46/142

DS13490 Rev 1

Figure 10. SPI communication: writing a single byte

Figure 11. SPI communication: writing multiple bytes

Reading data from addressable registers (Read register mode)

The SPI operation mode bits are followed by the address of the register to be read. Then

one or more data bytes are transferred to MISO output (MSB first) for as long as SCLK is

present. This mode also supports address auto-incrementing. If there is no register at a

certain address, then all 0 data is sent to MISO.

Figure 12 is an example of reading a single byte.

MS51644V1

BSS

SCLK

MOSI

Two leading bits

indicate mode

SCLK rising edge

Data transferred from MCU

SCLK falling edge

Data is sampled

Data is moved to

address <A5-A0>

Raising

edge

indicates

end of

Write mode

MS51645V1

BSS raising edge

indicates end of

Write mode

Two leading 0s

indicate Write mode

SCLK falling edge

Data moved to

address <A5-A0>

00 A5

BSS

SCLK

MOSI

SCLK falling edge

Data moved to

address <A5-A0> + 1

SCLK falling edge

Data moved to

address <A5-A0> + (n-1)

SCLK falling edge

Data moved to

address <A5-A0> + n

ST25R3918 Datasheet(PDF) 46 Page - STMicroelectronics

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