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K60 clock frequency changes without JTAG debugger

Question asked by Nancy Jean Burkholder on May 4, 2012
Latest reply on May 7, 2012 by Nancy Jean Burkholder
I am creating software for our target hardware that uses two PK60FX512VLQ12 processors. The software uses MQX BSP/PSP version twrk60f120m. The cpu is clocked from an external 50 MHz oscillator. When running the target from the JTAG debugger (USB Multilink Universal) the processor runs at the expected speed of 120 MHz. When I disconnect the debugger and run from flash, either debug or release, the clock appears to run at 50 MHz. I observe that the UART and CAN baud rates are reduced by a factor of 2.4 (120/50). Looking at the BSP clock management code (bsp_cm) there is one clock configuration. Can someone explain why the processor runs at the slower speed without the debugger connected?

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