ST25R200 datasheet(18/88 Pages) STMICROELECTRONICS

18 / 88 page

Figure 11. SPI communication: reading of single byte

SCLK rising edge

Data is moved

from address

<A6-A0>

BSS rising

edge signals

end of READ

Mode

‘1’ Read

tristate

SCLK rising

edge Data is

transfered

from µC

SCLK falling

edge Data is

sampled

SCLK falling

edge Data is

transfered to µC

BSS

SCLK

MOSI

MISO

Figure 12. SPI communication: reading of multiple bytes

BSS

SCLK

MOSI

tristate

Data is moved

from Address

<A6-A0> + n

BSS rising edge

signals end of

READ Mode

‘1’ Read

Data is moved

from Address

<A6-A0> + (n-1)

Data is moved

from Address

<A6-A0> + 1

Data is

moved from

Address

<A6-A0>

tristate

MISO

Direct command mode

The direct command mode has no additional data apart from the command code itself, therefore a single byte is

sent MSB first. Execution of the direct command starts after the last clock.

Figure 13. SPI communication: direct command

SCLK rising edge

Data is transferred

from µC

SCLK falling edge

Data is sampled

Last SCLK falling edge

signals start of command

execution

Command

BSS

SCLK

MOSI

While the execution of some direct commands is immediate, there are others that start a process of certain

duration (for instance calibration, and measurements). During the execution of such commands it is not allowed to

start another activity over the SPI interface, an IRQ is sent when the execution has terminated.

ST25R200

Application information

DS13658 - Rev 2

page 18/88

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