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ATPL00B Datasheet(PDF) 22 Page - ATMEL Corporation |
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ATPL00B Datasheet(HTML) 22 Page - ATMEL Corporation |
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22 / 152 page ![]() Atmel ATPL00B [datasheet] 43028A-ATPL - 9/12 22 Common and extended memory sizes vary depending on the value in P0(7:6), as shown above. According to these size values, the core knows when the PC is pointing to an address located in common memory and when it is pointing to an address located in extended memory. When PC is pointing to an address in extended memory, then P0(5:0) indicates the extended page number and the physical address is automatically calculated. Some examples are shown below. Example: SX(1:0)=”00” (common memory size = 32KB) PC=0x7F23 (PC pointing to an address in common memory space) P0(5:0)= don ‟t care LOGIC ADDRESS=0x7F23, common memory space PHYSICAL ADDRESS=0x7F23 (common memory space P0(5:0) is ignored) Figure 4-5. Extended Addressing example 1 Common Program PAGE 0 PAGE 1 0x000000 0x00BFFF 0x00C000 0x00FFFF 0x010000 PAGE 2 0x013FFF 0x014000 Physical Address = 0x7F23 Common Program PAGE 0 0x000000 0x00BFFF 0x00C000 0x00FFFF PC=0x7F23 Logical Address = 0x7F23, (commom memory space) Physical Address = PC = 0x7F23 |
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