MCU Clock

[GunkutA]

Hello I'm not sure about setting the clock frequency in MicroC. Normally I do it with registers but in program there is a MCU Clock frequency window in left part. Is this working? If I want 8 MHz clock for example, when I write 8 MHz in there, will it set my clock to 8 MHz? I tested it and it doeesn't look like it's working for me. Thanks

[janni]

This is only information for compiler - used for software delays and communication baud rates calculations.

[GunkutA]

This is only information for compiler - used for software delays and communication baud rates calculations.

So if I want to implement 250 kbps can bus communication, do I need to take the clock value that is in MCU clock window or the value I achieve with registers. For example: if I have a 1 MHz value in MCU Clock window and I arrange my registers for 8 MHZ internal oscillator. Which one should I consider for calculating my Can Bus timing values? 8 Mhz one or 1 Mhz one? Thanks.

[janni]

For example: if I have a 1 MHz value in MCU Clock window and I arrange my registers for 8 MHZ internal oscillator. Which one should I consider for calculating my Can Bus timing values? 8 Mhz one or 1 Mhz one? Thanks.

Wrong question. One value should match the other. If you want time-dependent peripherals and delays to work correctly, you cannot lie about clock frequency . Compiler doesn't follow your clock settings and cannot know what is external crystal frequency - that's why you have to put the effective frequency in Project Settings window.

[GunkutA]

Clear, thank you Janni