3

2466S–AVR–05/09

ATmega16(L)

Overview

The ATmega16 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC

architecture. By executing powerful instructions in a single clock cycle, the ATmega16 achieves

throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power con-

sumption versus processing speed.

Block Diagram

Figure 2. Block Diagram

INTERNAL

OSCILLATOR

OSCILLATOR

WATCHDOG

TIMER

MCU CTRL.

& TIMING

OSCILLATOR

TIMERS/

COUNTERS

INTERRUPT

UNIT

STACK

POINTER

EEPROM

SRAM

STATUS

REGISTER

USART

PROGRAM

COUNTER

PROGRAM

FLASH

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

PROGRAMMING

LOGIC

SPI

ADC

INTERFACE

COMP.

INTERFACE

PORTA DRIVERS/BUFFERS

PORTA DIGITAL INTERFACE

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

+

-

PORTC DRIVERS/BUFFERS

PORTC DIGITAL INTERFACE

PORTB DIGITAL INTERFACE

PORTB DRIVERS/BUFFERS

PORTD DIGITAL INTERFACE

PORTD DRIVERS/BUFFERS

XTAL1

XTAL2

RESET

CONTROL

LINES

VCC

GND

MUX &

ADC

AREF

PA0 - PA7

PC0 - PC7

PD0 - PD7

PB0 - PB7

AVR CPU

TWI

AVCC

INTERNAL

CALIBRATED

OSCILLATOR