| ??? 11/23/04 17:49 Read: times |
#81782 - Just small doubt Responding to: ???'s previous message |
Cristian,
Actually I used an AT89C2051 to do this job. It is an old project (7-8 years old I think) so I forgot details. The Manchester code decoding and the row-column parity calculation “eat” about 200 bytes Interestingly, I had used the same AT89C2051 with the same clock. But my manchester decoding took 40 bytes only. There is a little trick regarding the 180 deg phase incertitude introduced by Manchester scheme but it is easy to manage What are you talking about? What is phase incertitude? I ported the software to an AVR atmega8 (for some commercial reasons) and I found the software to be twice longer that for at89c2051. I think this is because of the bit instruction facilities of the 8051 core and the automatic calculation of the parity in ACC. So I strongly recommend 8051 core for such task Well, with due respect to the old good fellow 8051 I cannot believe that ATmega doubles the program space. My 8051-program size was about 1KB, and I reckon that ATmega code will be smaller. The ATmega parity calculation for one byte takes 3.6us at 11MHz clock and code size is 8 bytes. Regards, George |
| Topic | Author | Date |
| RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RFID reader IC[urgent] | 01/01/70 00:00 | |
| RE: RFID reader IC[urgent] | 01/01/70 00:00 | |
| RE: RFID reader IC | 01/01/70 00:00 | |
| RFID - em4095 | 01/01/70 00:00 | |
| Just small doubt | 01/01/70 00:00 | |
| RFID small doubt | 01/01/70 00:00 | |
| There Is Not A Shadow Of Dout | 01/01/70 00:00 | |
| Code size | 01/01/70 00:00 | |
| The Code Size Again | 01/01/70 00:00 | |
| To George Maccayev | 01/01/70 00:00 | |
| to Ravi | 01/01/70 00:00 | |
| To George Maccayev | 01/01/70 00:00 | |
| Nothing Special | 01/01/70 00:00 | |
| Thanks Cristian | 01/01/70 00:00 | |
| RFID | 01/01/70 00:00 | |
| To Cristian | 01/01/70 00:00 | |
| Buy ready made! | 01/01/70 00:00 | |
Further info.. | 01/01/70 00:00 |