| ??? 09/04/07 08:28 Read: times |
#143977 - Sorry, The pic ... Responding to: ???'s previous message |
Hi All,
I have designed & built this circuit with RTC M48T08 from ST (8KByte Non-Volatile RAM with full time Keeping). Every time that the circuit powers up , the value 00H overwrites on first byte means location 0000H of RTC automatically and previous data in this location clears . I changed chip selecting of RTC with active low (CE1) instead of CE2 . and connecting CE2 to Vcc .But problem insists . Every time ,I haven't special codes on 89C52 . Only transmitting RTC contents via com port . Could anyone find the bug! Regards. 
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| Topic | Author | Date |
| 00H overwrites first RTC Address byte | 01/01/70 00:00 | |
| Ha! Our favorite reset problem! | 01/01/70 00:00 | |
| Sorry, The pic ... | 01/01/70 00:00 | |
| yes, this is it | 01/01/70 00:00 | |
| Reason is promotion tool ! | 01/01/70 00:00 | |
| neither | 01/01/70 00:00 | |
| actually, in this case... | 01/01/70 00:00 | |
| I am not completely certain in this case... | 01/01/70 00:00 | |
| I suspect | 01/01/70 00:00 | |
| only if the external device is bipolar or | 01/01/70 00:00 | |
| Not so sure | 01/01/70 00:00 | |
still - not really | 01/01/70 00:00 |