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CR14 Datasheet(PDF) 23 Page - STMicroelectronics |
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CR14 Datasheet(HTML) 23 Page - STMicroelectronics |
23 / 46 page CR14 5 Applying the I²C protocol to the CR14 registers 23/46 5.2 I²C Input/Output Frame Register Protocol Figure 13 shows how to store a PICC request frame command of N Bytes into the Input/Output Frame Register. After the I²C STOP condition, the request frame is RF transmitted in the ISO14443 type-B format. The CR14 then waits for the PICC answer frame which will also be stored in the Input/ Output Frame Register. The request frame is over-written by the answer frame. Figure 14 shows how to read an N-Byte PICC answer frame. The two CRC Bytes generated by the PICC are not stored. The CR14 continues to output data Bytes until a NoACK has been generated by the I²C Host, and received by the CR14. After all 36 Bytes have been output, the CR14 “rolls over”, and starts outputting from the start of the Input/Output Frame Register again. The CR14 supports the I²C Current Address and Random Address Read modes. The Current Address Read mode can be used if the previous command was issued to the register where the Read is to take place. Figure 13. Host-to-CR14 Transfer: I²C Write to Input/Output Frame Register for ISO14443B Figure 14. CR14-to-Host Transfer: I²C Random Address Read from Input/Output Frame Register for ISO14443B S T A R T 1 0 1 0 XX X 01h N S T O P ACK ACK ACK Request Frame Length N Input/Output Register Address Device Select Code Bus Master CR14 Write Bus Slave ai12041 R/W Data 1 Data 2 PICC Command Parameter PICC Command Code Data N PICC Command Parameter PICC Command Parameter ACK ACK ACK ACK S T A R T 10 10 XXX 01h N S T O P ACK ACK ACK Received Frame Length Input/Output Register Address Device Select Code Bus Master CR14 Read Bus Slave ai12042 R/W Data1 Data 2 Answer Frame Data Answer Frame Data Data N Answer Frame Data Answer Frame Data NoACK ACK ACK ACK R E S T A R T 1 0 1 0 XXX Device Select Code R/W ACK |
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