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MON51 require both external ram and rom?

MON51 require external ram or rom to work ?
i m using the 89s8252 from atmel
this microcontrol have 256 byte internal ram.

if i using this chip,
1. can i use the internal ram 256 byte for program code? without using the external ram ?
2. can i use the external ram, to store the program code and mon51 program ?
3. or MON51, must require external ram and rom, cant use interal ram ? external ram for store program code, and eeprom to store monitor51 program ?

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