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ATMEGA8535-16MI Datasheet(PDF) 17 Page - ATMEL Corporation |
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ATMEGA8535-16MI Datasheet(HTML) 17 Page - ATMEL Corporation |
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17 / 321 page  17 ATmega8535(L) 2502K–AVR–10/06 SRAM Data Memory Figure 9 shows how the ATmega8535 SRAM Memory is organized. The 608 Data Memory locations address the Register File, the I/O Memory, and the internal data SRAM. The first 96 locations address the Register File and I/O Memory, and the next 512 locations address the internal data SRAM. The five different addressing modes for the data memory cover: Direct, Indirect with Dis- placement, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register File, registers R26 to R31 feature the indirect addressing pointer registers. The direct addressing reaches the entire data space. The Indirect with Displacement mode reaches 63 address locations from the base address given by the Y- or Z-register. When using register indirect addressing modes with automatic pre-decrement and post- increment, the address registers X, Y, and Z are decremented or incremented. The 32 general purpose working registers, 64 I/O Registers, and the 512 bytes of inter- nal data SRAM in the ATmega8535 are all accessible through all these addressing modes. The Register File is described in “General Purpose Register File” on page 11. Figure 9. Data Memory Map Register File R0 R1 R2 R29 R30 R31 I/O Registers $00 $01 $02 ... $3D $3E $3F ... $0000 $0001 $0002 $001D $001E $001F $0020 $0021 $0022 ... $005D $005E $005F ... Data Address Space $0060 $0061 $025E $025F ... Internal SRAM |
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