TI RI-R6C RFID

jacqueskleynhans · Posted: Thu Feb 10, 2011 2:45 am

HI Guys, I need to interface this RFID to a PIC 18f4550 : http://focus.ti.com/lit/ug/scbu030/scbu030.pdf

Its a +-14Mhz transceiver IC from TI.

This HF Transceiver is using a weird or more politically correct (a communication protocol that's unknown to me).

Page 11 of the data sheet form link above

jacqueskleynhans · Posted: Thu Feb 10, 2011 3:16 pm

Hi Ok I managed to bit bang my way through the protocol but I have encountered a problem...

Can someone please check in the data sheet I linked on pg 27 under protocol definitions fig 4.4 what the data= to be sent to TAG function is ...

S'il vous plait Smile

Thx
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temtronic · Posted: Thu Feb 10, 2011 3:33 pm

A quick look at the datasheet and I read it that

the 'command' bits configure the chip for one of several protocols and the next series of bits is the actual data to be transmitted to the RF receiver.

Unlike most UART communications of a fixed data length( 1 byte or 8 bits), this chip allows data to be variable in length.

Once the stop bit is seen, the 'tag' data is sent using the 'protocol' at the head of that datastream or packet.

Very versatile as it allows several 'layers of security', different 'protocol' and 'messages' (data) would make a system with this device very hard to break into !

Kind of a swiss army knife 'Ultimate UART' as every transmission could have a different protocol and msg length.

at least that's the way I read it..