C6745 program crashes after executing the statement "pll0 - > pllctl | = 0x1". The "pll0 - > pllctl | = 0x1" statement means that the pllen bit of the pllctl register is written to 1.
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Were you trying to change the PLL0 frequency? If that's the case, please follow the proper steps described in the TRM, section 7.2.2 Steps for Changing PLL0 Domain Frequency.
Please also refer to the Processor SDK for C6745/C6747 for example code. After you download and install the SDK, please look at source code: pdk_omapl137_1_0_11\packages\ti\board\src\evmOMAPL137\evmOMAPL137_pll.c.
Hope this helps.