| ??? 06/09/05 20:29 Read: times |
#94588 - Supervisor needed ! Responding to: ???'s previous message |
You need at least a supervisor circuit to prevent the AT89C52 from crazy behaviour during power up and power down cycle !
Also after any reset you must at first bring the I2C bus in the bus free state. This can be done by trying up to 9 times to send a stop condition. Furthermore it may be needed to prevent both I2C-lines from floating (pull up or pull down resistors). Peter |
| Topic | Author | Date |
| RTC problem | 01/01/70 00:00 | |
| What 89C52 derivative? | 01/01/70 00:00 | |
| re | 01/01/70 00:00 | |
| You stated that in the first post | 01/01/70 00:00 | |
| re | 01/01/70 00:00 | |
| Hold time | 01/01/70 00:00 | |
| Supervisor needed ! | 01/01/70 00:00 | |
I2C Uses Pullup Resistors | 01/01/70 00:00 |