DEMOKITCRX14 STMicroelectronics, DEMOKITCRX14 Datasheet - Page 19

• Manufacturer Part Number: DEMOKITCRX14
• Description: RFID EVALUATION KIT ISO14443-B
• Manufacturer: STMicroelectronics
• Type: Development kitr

Specifications of DEMOKITCRX14

• Contents: CD-ROM, CRX14 Board, USB Transceiver, Samples and Documentation
• Processor To Be Evaluated: CRX14
• Interface Type: I2C
• Operating Supply Voltage: 5 V
• For Use With/related Products: CRX14
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3704

I²C Authenticate Register Protocol
For information please contact your nearest STMi-
croelectronics sales office.
I²C Slot Marker Register Protocol
An I²C Write command to the Slot Marker Register
generates an automated sixteen-command loop
(See
All the answers from the ST short range memory
devices that are detected, are written in the Input/
Output Frame Register.
Figure 17. Host-to-CRX14 Transfer: I²C Write to Slot Marker Register
Figure 18. CRX14-to-Host Transfer: I²C Random Address Read from Slot Marker Register
Figure 19. CRX14-to-Host Transfer: I²C Current Address Read from Slot Marker Register
CRX14 Read
Bus Master
Bus Slave
Figure 17.
S
T
A
R
T
for a description of the command).
1 0 1 0 X X X
CRX14 Read
Device Select
CRX14 Write
Bus Master
Bus Master
Bus Slave
Bus Slave
Code
R/W
ACK
S
T
A
R
T
S
T
A
R
T
1 0 1 0 X X X
1 0 1 0 X X X
Device Select
Device Select
Slot Marker
Register
Address
Code
Code
00h
R/W
R/W
ACK
ACK
ACK
Read from the I²C Slot Marker Register is not sup-
ported by the CRX14. If the I²C Host tries to read
the Slot Marker Register, the CRX14 will return the
data value FFh in both Random Address and Cur-
rent Address Read modes until NoACK is generat-
ed by the I²C Host.
The result of the detection sequence is stored in
the Input/Output Frame Register. This Register
can be read by the host by using I²C Random Ad-
dress Read.
R
E
S
T
A
R
T
1 0 1 0 X X X
Slot Marker
Device Select
Register
Address
03h
FFh
Code
NoACK
R/W
ACK
ACK
S
T
O
P
S
T
O
P
FFh
NoACK
CRX14
ai09246
ai09247
S
T
O
P
ai09248
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