ATMEGA161 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA161

8-bit Microcontroller with 16K Bytes In-System Programmable Flash

Atmel Corporation 

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 registers in the register file are executed. The ALU operations are divided into

three main categories – arithmetic, logical, and bit-functions. ATmega161 does also provide a powerful multiplier support-

ing both signed/unsigned multiplication and fractional format. See Instruction Set section for a detailed description.

Self-programmable Flash Program Memory

The ATmega161 contains 16K bytes on-chip Self- and In-System 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 memory has an endurance of at least

1000 write/erase cycles. The ATmega161 Program Counter (PC) is 13 bits wide, thus addressing the 8192 program

memory locations.

See page 95 for a detailed description on Flash data downloading.

See page 11 for the different program memory addressing modes.

EEPROM Data Memory

The ATmega161 contains 512 bytes of data EEPROM memory. It is organized as a separate data space, in which single

bytes can be read and written. The EEPROM has an endurance of at least 100,000 write/erase cycles per location. The

interface between the EEPROM and the CPU is described on page 54 specifying the EEPROM address registers, the

EEPROM data register, and the EEPROM control register.

For the SPI data downloading, see page 109 for a detailed description.

Figure 8. SRAM Organization

Register File

R0

R1

R2

º

Data Address Space

$0000

$0001

$0002

º

R29

R30

R31

I/O Registers

$00

$01

$02

…

$001D

$001E

$001F

$0020

$0021

$0022

…

$3D

$005D

$3E

$005E

$3F

$005F

Internal SRAM

$0060

$0061

º

$045E

$045F

10

ATmega161(L)

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