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TM4C1230D5PM: How do you set system clock to 80 MHz

Part Number: TM4C1230D5PM

When setting up the PLL and clocking, I expected to get 80 MHz.  My test loop has 7 instructions in it and it produces 5.7MHz square wave

Assuming 1 clock per instruction (that's an assumption), the system clock is 40 MHz.

If each instruction takes 2 clocks, then everything is working correctly.

I use the following call from the SDK