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AT43USB320A-AC Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT43USB320A-AC Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 115 page  9 AT43USB320A 1443E–USB–4/04 X-, Y- and Z- Registers Registers R26..R31 contain some added functions to their general-purpose usage. These reg- isters are address pointers for indirect addressing of the Data Space. The three indirect address registers X, Y, and Z are defined as: In the different addressing modes these address registers have functions as fixed displace- ment, 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 32 general purpose working registers. Within a single clock cycle, ALU operations between registers in the register file are executed. The ALU operations are divided into three main categories – arithmetic, log- ical and bit-functions. Program Memory The AT43USB320A operates from an external program memory. Since all instructions are 16- or 32-bit words, the program memory is organized as X16. The AT43USB320A Program Counter (PC) is 16 bits wide, thus addressing the 64K program memory addresses. Constant tables can be allocated within the entire program memory address space (see the LPM - Load Program Memory instruction description). X-register 15 XH XL 0 70 7 0 R27 ($1B) R26 ($1A) Y-register 15 YH YL 0 70 7 0 R29 ($1D) R28 ($1C) Z-register 15 ZH ZL 0 70 7 0 R30 ($1F) R31 ($1E) |
Similar Part No. - AT43USB320A-AC |
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Similar Description - AT43USB320A-AC |
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