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请教 Flash_CPUScaleFactor = SCALE_FACTOR;这句话的含义

专家您好:

我在调试FLASH例程的时候遇到这一句话:

EALLOW;
Flash_CPUScaleFactor = SCALE_FACTOR;
EDIS;

发现去掉:

EALLOW;
EDIS;

这两条保护寄存器指令时,

FLASH不能正确的擦除和编写?

所以,请教

Flash_CPUScaleFactor = SCALE_FACTOR;

真正的含义?

谢谢