lpcware

PLL0 Issues, doesn't seem to change the clock rate!

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by beefok on Sat Nov 12 01:32:41 MST 2011
So I have this LED blinker example running. Now I want to initiate to PLL0 and clock the system at a much higher frequency. I can send all the values for the PLL0, wait for it to lock on, and all of this works well. However, I do not notice a difference in the speed of the LED blinking. What am I missing? Why isn't the LED blinking faster? My PLL0 output should be around 84~MHz. My values are 0x01 for CLKSRCSEL, 0x0015013A for PLL0CFG, and CCLKCFG has a value of 0x00000003. I made my example in both C with the CMSIS lib and in pure ASM. They both blink perfectly fine.. but the speed is the same as it was with the default values of RESET! What gives?

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