8-bit with 8K Bytes In-System Programmable Flash ATmega8A
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 16 MIPS Throughput at 16 MHz
– On-chip 2-cycle Multiplier
• High Endurance Non-volatile Memory segments
– 8K Bytes of In-System Self-programmable Flash program memory
– 512 Bytes EEPROM
– 1K Byte Internal SRAM
– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
– Data retention: 20 years at 85°C/100 years at 25°C(1)
– Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True Read-While-Write Operation
– Programming Lock for Software Security
• Peripheral Features
– Two 8-bit Timer/Counters with Separate Prescaler, one Compare
Mode
– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode,
and Capture Mode
– Real Time Counter with Separate Oscillator
– Three PWM Channels
– 8-channel ADC in TQFP and QFN/MLF package
• Eight Channels 10-bit Accuracy
– 6-channel ADC in PDIP package
• Six Channels 10-bit Accuracy
– Byte-oriented Two-wire Serial Interface
– Programmable Serial USART
– Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
• 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-lead PDIP, 32-lead TQFP, and 32-pad QFN/MLF
• Operating Voltages
– 2.7 - 5.5V for ATmega8A
• Speed Grades
– 0 - 16 MHz for ATmega8A
• Power Consumption at 4 Mhz, 3V, 25°C
– Active: 3.6 mA
– Idle Mode: 1.0 mA
– Power-down Mode: 0.5 µA
Absolute Maximum Ratings*
Operating Temperature.................................. -55°C to
+125°C
Storage Temperature ..................................... -65°C to
+150°C
Voltage on any Pin except RESET
with respect to Ground ................................-0.5V to
VCC+0.5V
Voltage on RESET with respect to Ground......-0.5V to +13.0V
Maximum Operating Voltage
............................................ 6.0V
DC Current per I/O Pin
............................................... 40.0 mA
DC Current VCC and GND Pins................................ 300.0
mA
*NOTICE: Stresses beyond those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
other conditions beyond those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Pin Configurations
Pinout ATmega8A
PDIP
TQFP Top View
MLF Top View
Overview
The ATmega8A is a low-power CMOS 8-bit microcontroller based on the
AVR RISC architecture. By executing powerful instructions in a
single clock cycle, the ATmega8A achieves throughputs approaching 1
MIPS per MHz, allowing the system designer to optimize power
consumption versus processing speed.
Block Diagram
