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CY7C68013 CPU Control Status Register using Keil

Does anyone know why the debugger in Keil uvision2 using CY7C68013A does not like this piece of code?

        CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1) ;
//      CPUCS = 0x0E;


That register is supposed to change the clock speed. If I want to write 0x0E to it the debugger does not work. What is so special about that register? Does anyone have the same problem?

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