atmega163l ATMEL Corporation, atmega163l Datasheet - Page 11

• Manufacturer Part Number: atmega163l
• Description: Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

The ALU – Arithmetic
Logic Unit
The In-System Self-
Programmable Flash
Program Memory
The SRAM Data Memory
1142E–AVR–02/03
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).
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. ATmega163 also provides a powerful
multiplier supporting both signed/unsigned multiplication and fractional format. See the
Instruction Set section for a detailed description.
The ATmega163 contains 16K bytes On-chip In-System Self-Programmable Flash
memory for program storage. Since all instructions are 16- or 32-bit words, the Flash is
organized as 8K x 16. The Flash Program memory space is divided in two sections,
Boot Program section and Application Program section.
The Flash memory has an endurance of at least 1,000 write/erase cycles. The
ATmega163 Program Counter (PC) is 13 bits wide, thus addressing the 8,192 Program
Memory locations. The operation of Boot Program section and associated Boot Lock
bits for software protection are described in detail on page 134. See also page 154 for a
detailed description on Flash data serial downloading.
Constant tables can be allocated within the entire Program Memory address space (see
the LPM – Load Program Memory instruction description).
See also page 12 for the different Program Memory Addressing modes.
Figure 9 shows how the ATmega163 SRAM Memory is organized.
Figure 9. SRAM Organization
I/O Registers
Register File
R29
R30
R31
$3D
$3E
$3F
$00
$01
$02
R0
R1
R2
...
...
ATmega163(L)
Data Address Space
Internal SRAM
$001D
$005D
$0000
$0001
$001E
$0020
$0021
$0022
$005E
$005F
$0060
$0061
$045E
$045F
$0002
$001F
...
...
...
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