at90ls8535-8mi ATMEL Corporation, at90ls8535-8mi Datasheet - Page 10

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at90ls8535-8mi

Manufacturer Part Number
at90ls8535-8mi
Description
8-bit Microcontroller With 8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
X-register, Y-register and Z-
register
ALU – Arithmetic Logic
Unit
In-System Programmable
Flash Program Memory
10
AT90S/LS8535
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).
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.
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.
X-register
Y-register
Z-register
15
7
15
7
15
7
R27 ($1B)
R29 ($1D)
R31 ($1F)
0
0
0
7
7
7
R28 ($1C)
R30 ($1E)
R26 ($1A)
1041H–11/01
0
0
0
0
0
0

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