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AT90LS4433 Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT90LS4433 Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 126 page  11 AT90S/LS4433 1042H–AVR–04/03 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 AT90S4433 contains 4K bytes of 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 2K x 16. The Flash memory has an endurance of at least 1,000 write/erase cycles. The AT90S4433 Program Counter (PC) is 11 bits wide, thus addressing the 2,048 program memory addresses. See page 93 for a detailed description of Flash data downloading. See page 12 for the different program memory addressing modes. Figure 9. SRAM Organization SRAM Data Memory Figure 9 shows how the AT90S4433 SRAM memory is organized. The lower 224 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 mem- ory, and the next 128 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. Register File Data Address Space R0 $0000 R1 $0001 R2 $0002 º º R29 $001D R30 $001E R31 $001F I/O Registers $00 $0020 $01 $0021 $02 $0022 …… $3D $005D $3E $005E $3F $005F Internal SRAM $0060 $0061 º $00DE $00DF |
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