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ATmega8A 28-Pin 16MHz 8kB AVR Microcontroller

Photograph
ATMEGA8A-PU - ATmega8 28-Pin 16MHz 8kb 8-bit Microcontroller

Features
  • Advanced RISC Architecture
  • High-performance and Low-power 8-bit RISC Architecture
    • - 130 Instructions - Most Single Clock Cycle Execution
    • - 32 x 8 General Purpose Working Registers
    • - Up to 16 MIPS Throughput at 16MHz
    • - Fully Static Operation
    • - On-chip 2-cycle Multiplier
  • Data and Nonvolatile Program Memory
    • - 8k Bytes of In-System Self-Programmable Flash
    • - Optional Boot Code Section with Independent Lock Bits
    • - 512 Bytes EEPROM
    • - 1K Bytes Internal SRAM
    • - Programming Lock for Software Security
  • Peripheral Features
    • - On-chip Analog Comparator
    • - Programmable Watchdog Timer with Separate On-chip Oscillator
    • - Master/Slave SPI Serial Interface
    • - Two 8-bit Timer/Counters with Separate Prescalar, Compare
    • - One 16-bit Timer/Counter with Separate Prescaler, Compare and Capture mode
    • - Real Time Counter with Separate Oscillator
    • - Three PWM Channels
    • - Programmable Serial USART
    • - 6-channel, 10-bit ADC
    • - Byte-oriented Two-wire Serial Interface
  • Special Microcontroller Features
    • - Power-on Reset and Programmable Brown-out Detection
    • - Internal Calibrated RC Oscillator
    • - External and Internal Interrupt Sources
    • - Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down and Standby
  • I/O and Packages
    • - 23 Programmable I/O Lines
    • - 28-pin PDIP, 32-lead TQFP, and 32-pad MLF
  • Operating Voltages
    • - 4.5-5.5V for ATmega8
  • Speed Grades
    • - 0-16MHz for ATmega8
  • Power Consumption at 4 Mhz, 3V, 35 °C
    • - Active: 3.6mA
    • - Idle Mode: 10mA
    • - Power-down Mode: < 0.5µA

Pin Layout
ATmega8 Pin Layout

Pin Description
Pin Number Description
1 (RESET) Port C6
2 (RXD) Port D0
3 (TXD) Port D1
4 (INT0) Port D2
5 (INT1) Port D3
6 (XCK/T0) Port D4
7 Vcc - Positive Power Supply
8 GND - Ground
9 (XTAL1/TOSC1) Port B6
10 (XTAL2/TOSC2) Port B7
11 (T1)Port D5
12 (AIN0) Port D6
13 (AIN1) Port D7
14 (ICP1) Port B0
15 (OC1A) Port B1
16 (SS/OC1B) Port B2
17 (MOSI/OC2) Port B3
18 (MISO) Port B4
19 (SCK) Port B5
20 AVCC - Analog Power Supply
21 AREF - Analog Reference
22 GND - Ground
23 (ADC0) Port C0
24 (ADC1) Port C1
25 (ADC2) Port C2
26 (ADC3) Port C3
27 (ADC4/SDA) Port C4
28 (ADC5/SCL) PC5

Dimensional Drawing
ATmega8 PDIP28 Dimension Drawing