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AT89C51AC3-RDTUM Datasheet(PDF) 53 Page - ATMEL Corporation |
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AT89C51AC3-RDTUM Datasheet(HTML) 53 Page - ATMEL Corporation |
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53 / 143 page  53 AT89C51AC3 4383B–8051–01/05 Operation Cross Memory Access Space addressable in read and write are: •RAM • ERAM (Expanded RAM access by movx) • XRAM (eXternal RAM) • EEPROM DATA • FM0 ( user flash ) • Hardware byte •XROW • Boot Flash • Flash Column latch The table below provide the different kind of memory which can be accessed from differ- ent code location. Note: 1. RWW: Read While Write Table 18. Cross Memory Access Action RAM XRAM ERAM Boot FLASH FM0 E² Data Hardware Byte XROW boot FLASH Read OK OK OK OK - Write - OK(1) OK(1) OK(1) OK(1) FM0 Read OK OK OK OK - Write - OK (idle) OK(1) -OK External memory EA = 0 or Code Roll Over Read - - OK - - Write - - OK(1) -- |
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