IAP programming in p89c669

Hi!
i use the P89c669 microcontroller,can i erase and reprogram the hole flash memory by using the IAP method.now i try this and i am not able to do this in lower memory area [from address 0x0000].i can do this in only above the 8K memory.
Thank you!
regards,
K.T.Venkatesh.

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