Features: • High-performance, Low-power AVR® 8-bit Microcontroller
• Advanced RISC Architecture
130 Powerful Instructions - Most Single Clock Cycle Execution
32 x 8 General Purpose Working Registers
Fully Static Operation
Up to 8 MIPS Throughput at 8 MHz
On-chip 2-cycle Multiplier
• Program and Data Memories
16K Bytes of Nonvolatile In-System Programmable Flash Endurance: 1,000 Write/Erase Cycles
Optional Boot Code Memory with Independent Lock Bits Self-programming of Program and Data Memories
512 Bytes Nonvolatile In-System Programmable EEPROM Endurance: 100,000 Write/Erase Cycles
1K Bytes Internal SRAM
Programming Lock for Software Security
• Peripheral Features
Two 8-bit Timer/Counters with Separate Prescaler and PWM
Expanded 16-bit Timer/Counter System with Separate Prescaler, Compare, Capture Modes and Dual 8-, 9- or 10-bit PWM
Dual Programmable Serial UARTs
Master/Slave SPI Serial Interface
Real Time Counter with Separate Oscillator
Programmable Watchdog Timer with Separate On-chip Oscillator
On-chip Analog Comparator
• Special Microcontroller Features
Power-on Reset and Programmable Brown-out Detection
External and Internal Interrupt Sources
Three Sleep Modes: Idle, Power Save and Power-down
• I/O and Packages
35 Programmable I/O Lines
40-pin PDIP, 44-pin PLCC and TQFP
• Operating Voltages
2.7V - 5.5V (ATmega161L), 4.0V - 5.5V (ATmega161)
• Speed Grades
0 - 4 MHz (ATmega161L), 0 - 8 MHz (ATmega161)
• Commercial and Industrial Temperature RangesPinout
DescriptionThe ATmega161 is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega161 achieves throughputs approaching 1 MIPS per MHz allowing the sys-tem designer to optimize power consumption versus processing speed.The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU),allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The ATmega161 provides the following features: 16K bytes of In-System- or Self-programmable Flash, 512 bytes EEPROM, 1K bytes SRAM, 35 general purpose I/O lines, 32 general purpose working registers, Real Time Counter, three flexible timer/counters with compare modes, internal and external interrupts, two programmable serial UARTs, programma-ble Watchdog Timer with internal oscillator, an SPI serial port and three software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, timer/counters, SPI port and interrupt system to continue functioning. The power-down mode saves the register and SRAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset. In Power Save mode, the timer oscillator continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping.
The device is manufactured using Atmel's high density nonvolatile memory technology. The on-chip Flash program mem-ory can be reprogrammed using the self-programming capability through the bootblock, using an ISP through the SPI-port,or by using a conventional nonvolatile memory programmer. By combining an enhanced RISC 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel ATmega161 is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications.
The ATmega161 AVR is supported with a full suite of program and system development tools including: C compilers,macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits.
ATmega161 Data Sheet
