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ST25R200 数据表(PDF) 18 Page - STMicroelectronics

部件名 ST25R200
功能描述  NFC/HF RFID reader IC
PDF  88 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST25R200 数据表(HTML) 18 Page - STMicroelectronics

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Figure 11. SPI communication: reading of single byte
1
A5
A4
A3
A2
A1
A0
0
X
SCLK rising edge
Data is moved
from address
<A6-A0>
BSS rising
edge signals
end of READ
Mode
‘1’ Read
D4
D3
D2
D1
D0
D7
D6
tristate
tristate
SCLK rising
edge Data is
transfered
from µC
SCLK falling
edge Data is
sampled
SCLK falling
edge Data is
transfered to µC
D5
BSS
SCLK
MOSI
MISO
A6
Figure 12. SPI communication: reading of multiple bytes
BSS
SCLK
MOSI
1
A
5
A
4
A
3
A
2
A
1
A
0
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
tristate
X
Data is moved
from Address
<A6-A0> + n
BSS rising edge
signals end of
READ Mode
‘1’ Read
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D0
D
7
D
6
D
1
D
0
Data is moved
from Address
<A6-A0> + (n-1)
Data is moved
from Address
<A6-A0> + 1
Data is
moved from
Address
<A6-A0>
A
6
0
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
C7
1
1
C4
C3
C2
C1
C0
X
X
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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