ATMEGA161-8AI(2007) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA161-8AI
(Rev.:2007)

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

Atmel Corporation 

ATmega161(L)

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. ATmega161 also provides a powerful

multiplier supporting both signed/unsigned multiplication and fractional format. See the

Instruction Set section for a detailed description.

Self-programmable Flash

Program Memory

The ATmega161 contains 16K bytes of On-chip Self-programmable and In-System Pro-

grammable 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 1,000 write/erase cycles. The ATmega161 Program Counter (PC) is 13 bits wide,

thus addressing the 8,192 Program memory locations.

See page 110 for a detailed description of Flash data downloading.

See page 13 for the different Program Memory Addressing modes.

EEPROM Data Memory

The ATmega161 contains 512 bytes of data EEPROM memory. It is organized as a sep-

arate 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 60, specifying the EEPROM Address Reg-

isters, the EEPROM Data Register and the EEPROM Control Register.

For the SPI data downloading, see page 125 for a detailed description.

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1228D–AVR–02/07

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