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C6748 更改CLKOUT功能问题

想通过CLKOUT / UHPI_HDS2 / PRU1_R30[13] / GP6[14] T18  将DSP的工作时钟引出来通过示波器观察确认下,但是OCSEL寄存器改不了,,,无论是在线改寄存器还是在gel或者主程序,都改不了,一直是14h,我想看其他分配信息看不到,,请问这个有什么保护吗?