U2270B/Manchester code

[zx81]

I'm trying to use a U2270B to read a trasponder. This chip uses Manchester code, I don't have doubts about the decoding process, but, how can I read the pulses? I don't know how to read the signal, pulse duration, etc.

Anybody has experience with that chip? I'm using a 16F628A, but the pcb is designed for a 12C672P.

Thanks

[Salutatous]

in VAR BIT
InTrs VAR PORTB.1 'On Out of U2270b

Read:
PauseUS 130 'for Osc 8
in=Intrs
If in=1 Then
....
if in=0 Then
....
etc..

Regards

[zx81]

Thanks!!

So I suppose that a complete pulse of the code (Manchester) uses 260 microseconds.

Is this correct?

In your sample you use PAUSEUS 130 for OSC 8, but if I use the internal resonator and don't use the OSC statement on my code (or if I use a 4Mhz external resonator), I suppose that the 130 value would still correct, isn't it? I don't know if you are adjusted the value for a 8Mhz resonator instead that picbasic adjust it via OSC statement.

Regards

[Salutatous]

in manchester code:
T=560µs and T/2=280µs
and i read 64 bits
my beta prog read ok the transponder but it need to be optimized!
i can send it if you need but comments are in french

[zx81]

Of course, your code will help me, if you can send me to [email protected] it would be great.

If you want I can test the code on my board and colaborate with you in the optimization of the read process.

Regards

[ct82]

Can you send the code to me as well? I need it for my project. Thanks!!