XFC Loopfilter C and R values

Started by Adrian Vos in 68HC1215 years ago 2 replies

Hi All, Is anyone able to help me out with the setting of the Capacitor/resistor values for the PLL loop filter (going to the...

Hi All, Is anyone able to help me out with the setting of the Capacitor/resistor values for the PLL loop filter (going to the XFC pin) on the S12DP256. I am using a 4MHz crystal, and plan to use the PLL to generate the max bus frequency of 25MHz (50MHz PLL output). To d


Trouble With Crystal Clock Generation on 9S12DP256

Started by rmk1113 in 68HC1214 years ago 8 replies

Hi All, I'm in the process of designing an MCU board using a 9S12DP256. I want to use a crystal and generate the clock...

Hi All, I'm in the process of designing an MCU board using a 9S12DP256. I want to use a crystal and generate the clock internally. I have used to recommended values (from Motorola) to set up the PLL filter on the XFC pin, but I currently have an interesting problem: