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TMS320F28035: a CLA question on the 28035

Part Number: TMS320F28035

Does these CLA registers can be write by the CPU?

//__meallow();

//Cla1Regs.MICLR.bit.INT1 =1;

//Cla1Regs.MICLROVF.bit.INT1 =1;

//Cla1Regs.MCTL.bit.SOFTRESET =1;

//ClaRegs.MIER.bit.INT =0;

//__medis();

And my customer used a 300K Hz PWM to trigger a CLA task, and the code exectution time of  the CLA task may be > (1/300K  second) sometimes ,which will result in interrupt overflow, so they want clear the overflowed interrupt(they try to use the register as mentioned earlier,but have no effect).Does anyone have a solution of this question? They should not change the pwm frequency.

Thanking you!