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ATmega128 Datasheet(PDF) 20 Page - ATMEL Corporation |
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ATmega128 Datasheet(HTML) 20 Page - ATMEL Corporation |
20 / 386 page 20 2467S–AVR–07/09 ATmega128 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-incre- ment, the address registers X, Y, and Z are decremented or incremented. The 32 general purpose working registers, 64 I/O registers, and the 4096 bytes of internal data SRAM in the ATmega128 are all accessible through all these addressing modes. The Register file is described in “General Purpose Register File” on page 12. Figure 9. Data Memory Map Memory Configuration B 32 Registers 64 I/O Registers Internal SRAM (4000 x 8) $0000 - $001F $0020 - $005F $1000 $0FFF $FFFF $0060 Data Memory External SRAM (0 - 64K x 8) Memory Configuration A 32 Registers 64 I/O Registers Internal SRAM (4096 x 8) $0000 - $001F $0020 - $005F $1100 $10FF $FFFF $0060 - $00FF Data Memory External SRAM (0 - 64K x 8) 160 Ext I/O Reg. $0100 |
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