AT90LS8535-4MC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT90LS8535-4MC
Atmel Corporation
AT90LS8535-4MC Datasheet PDF : 127 Pages
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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
15
X-register
7
R27 ($1B)
07
0
0
R26 ($1A)
15
Y-register
7
R29 ($1D)
07
0
0
R28 ($1C)
15
Z-register
7
R31 ($1F)
07
0
0
R30 ($1E)
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.
10 AT90S/LS8535
1041H–11/01
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