You know, to write to flash area, you have to set up FCDIV register once so that flash clock is in range 150-200kHz.
My bus frequency is 6.291456MHz in FEE mode, so I set divider as 35. (flash clock is 174.6KHz that is middle of the range)
For my application, the mcu enters to stop3 mode for a long time (a day), and then as soon as it wakes up, try to write some data to its flash area. As I know, mcu wakes at SCM mode to obtain fast wake-up time. it switch FEE mode automatically for a while later.
- How long time does it take mcu to switch FEE mode from SCM after waking-up?
- Should I wait for MCU to enter FEE mode before writting flash area?
- How does SCM frequency vary over temperature? There is a chart in the datasheet for trimmed 243kHz but, not for open loop DCO.
- If I try writting to flash area with open loop DCO after stop3, is it possible to violate 150kHz-200kHz range?
Message Edited by BasePointer on 2008-04-05 06:19 PM