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请教关于FLASH擦除一个片区中的部分内容

您好,请问DSP中的FLASH分为A、B\C\D\E\F等几个片区,请问可以擦除其中一个片区的一片数据么?还是只能整个片区?

例如:FLASHB      : origin = 0x3F0000, length = 0x004000     /* on-chip FLASH */

现只想擦除其中FLASHB中前1K字,能实现么?如果能实现该如何实现?谢谢