| ??? 06/01/07 07:32 Read: times |
#140139 - Using the DS1307 Responding to: ???'s previous message |
Farhan,
First of all try to read and write to the DS1307 registers using normal i2c routines. Note that bit7 of register 0 is the "clock halt" bit. So unless you specifically clear it when you are setting the time, your clock will never run. Also you will need to convert the DS1307 output back from BCD for your calculations. The accuracy of the DS1307 is only as good as its XTAL. Your AT89C52 could also keep the time if its XTAL is good. The advantage is that the DS1307 should keep time from its battery backup. So your timekeeping relies on a human setting the initial time and your device having sufficient stability to keep accurate time afterwards. David. p.s. as a suggestion to Craig. Surely 8052.com could handle tab to space conversion in postings, thereby keeping most people happy. |
| Topic | Author | Date |
| DS1307 code problem for AT89C52 | 01/01/70 00:00 | |
| What have you got so far? | 01/01/70 00:00 | |
| Things i have got so far | 01/01/70 00:00 | |
| DS1307 | 01/01/70 00:00 | |
| Code layout | 01/01/70 00:00 | |
| PHEW | 01/01/70 00:00 | |
| Use GPS receiver for Lat, Day and Time | 01/01/70 00:00 | |
| Very good idea! | 01/01/70 00:00 | |
| excellent idea | 01/01/70 00:00 | |
| Why Both | 01/01/70 00:00 | |
| have you heard of this thing called "Google" | 01/01/70 00:00 | |
| Comments on Formula | 01/01/70 00:00 | |
| there is code for this at the Maxim website | 01/01/70 00:00 | |
| GPS Receiver-Good Idea | 01/01/70 00:00 | |
| Why both?? | 01/01/70 00:00 | |
| Using the DS1307 | 01/01/70 00:00 | |
| re \"suggestion to Craig\" | 01/01/70 00:00 | |
| 8052.com expanding tabs into spaces | 01/01/70 00:00 | |
| Just read | 01/01/70 00:00 | |
| Tabs, 8052.com and email | 01/01/70 00:00 | |
| crunched by quoting AND email | 01/01/70 00:00 | |
| Bug in quoting | 01/01/70 00:00 | |
pre tags | 01/01/70 00:00 | |
| it is not just the tabs | 01/01/70 00:00 | |
| TABs are entirely unreliable - just avoid them! | 01/01/70 00:00 | |
| Tracking | 01/01/70 00:00 |