| ??? 02/25/12 11:59 Read: times |
#186189 - Datasheet Responding to: ???'s previous message |
It would be helpful to provide a link to the Datasheet.
It's listed here: http://www.atmel.com/devices/a...=documents Direct link: http://www.atmel.com/Images/doc3654A.pdf In the AT89LP428/828 Datasheet, Atmel said:
6.3 Internal RC Oscillator
The AT89LP428/828 has an Internal RC oscillator (IRC) tuned to 8.0 MHz ±1.0% at 5.0V and 25°C ... The frequency of the oscillator may be adjusted within limits by changing the RC Calibration Byte stored at byte 64 of the User Signature Array. This location may be updated using the IAP interface (location 00C0H in SIG space) or by an external device programmer (UROW location 0040H). See “User Signature and Analog Configuration” on page 122. So it should be 8.0 MHz ±1.0% at 5.0V and 25°C - if you're not getting that, under those conditions, you should contact your supplier, or FAE, or whatever. Are you sure you haven't adjusted the calibration? In the AT89LP428/828 Datasheet, Atmel said:
Table 23-7. Analog Configuration Definitions
Description: The RC Calibration Byte controls the frequency of the internal RC oscillator ... A copy of the factory-set calibration value is stored at location 0008H of the Atmel Signature. Have you checked that the "current" calibration setting matches the factory-set calibration value...? |
| Topic | Author | Date |
| at89lp828 RC oscillator frequency | 01/01/70 00:00 | |
| "about" 8 MHz | 01/01/70 00:00 | |
| Datasheet | 01/01/70 00:00 | |
| sounds to me like | 01/01/70 00:00 | |
forgot to update the datasheets | 01/01/70 00:00 |