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AT90S8535 Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 127 page  10 AT90S/LS8535 1041H–11/01 X-register, Y-register and Z- register The registers R26..R31 have some added functions to their general-purpose usage. These registers are address pointers for indirect addressing of the Data Space. The three indirect address registers, X, Y, and Z, are defined in Figure 7. Figure 7. X-, Y-, and Z-register In the different addressing modes, these address registers have functions as fixed dis- placement, automatic increment and decrement (see the descriptions for the different instructions). ALU – Arithmetic Logic Unit The high-performance AVR ALU operates in direct connection with all the 32 general- purpose working registers. Within a single clock cycle, ALU operations between regis- ters in the register file are executed. The ALU operations are divided into three main categories: arithmetic, logical and bit functions. In-System Programmable Flash Program Memory The AT90S8535 contains 8K bytes On-chip, In-System Programmable Flash memory for program storage. Since all instructions are 16- or 32-bit words, the Flash is orga- nized as 4K x 16. The Flash memory has an endurance of at least 1000 write/erase cycles. The AT90S8535 Program Counter (PC) is 12 bits wide, thus addressing the 4096 program memory addresses. See page 99 for a detailed description on Flash data downloading. See page 12 for the different program memory addressing modes. 15 0 X-register 7 0 7 0 R27 ($1B) R26 ($1A) 15 0 Y-register 7 0 7 0 R29 ($1D) R28 ($1C) 15 0 Z-register 7 0 7 0 R31 ($1F) R30 ($1E) |
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