Calculating bus clock and oscillator clock on MC9S12XDT512

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Calculating bus clock and oscillator clock on MC9S12XDT512

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mohg
Contributor I

              I am using MC9S12XDT512 SLK, with 4MHz crystal oscillator mounted on board. And I am using BUS Clock and Oscillator Clock for Enhaced Capture Timer for measuring pulse width. what will be my Bus clock and Oscillator clock frequency? How should I Calculate? I am not using PLL.

 

Thanks,

Mohg. 

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kef
Specialist I
With PLL not involved bus clock is oscilator clock / 2. It's 2MHz in your case. Almost all peripherals (including ECT) are clocked from bus clock. Flash and EEPROM modules use oscilator clock. MSCAN module has a control bit, that allows you to choose to clock MSCAN from oscilator clock or from bus clock.

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kef
Specialist I
With PLL not involved bus clock is oscilator clock / 2. It's 2MHz in your case. Almost all peripherals (including ECT) are clocked from bus clock. Flash and EEPROM modules use oscilator clock. MSCAN module has a control bit, that allows you to choose to clock MSCAN from oscilator clock or from bus clock.
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mohg
Contributor I
Thanks kef, i will let you know after completing the project.
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