Description
The ATtiny28 is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny28 achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general-purpose working registers.

FEATUREs
• Utilizes the AVR® RISC Architecture
• AVR – High-performance and Low-power RISC Architecture
– 90 Powerful Instructions – Most Single Clock Cycle Execution
– 32 x 8 General-purpose Working Registers
– Up to 4 MIPS Throughput at 4 MHz
• Nonvolatile Program Memory
– 2K Bytes of Flash Program Memory
– Endurance: 1,000 Write/Erase Cycles
– Programming Lock for Flash Program Data Security
• Peripheral Features
– Interrupt and Wake-up on Low-level Input
– One 8-bit Timer/Counter with Separate Prescaler
– On-chip Analog Comparator
– Programmable Watchdog Timer with On-chip Oscillator
– Built-in High-current LED Driver with Programmable Modulation
• Special Microcontroller Features
– Low-power Idle and Power-down Modes
– External and Internal Interrupt Sources
– Power-on Reset Circuit with Programmable Start-up Time
– Internal Calibrated RC Oscillator
• Power Consumption at 1 MHz, 2V, 25°C
– Active: 3.0 mA
– Idle Mode: 1.2 mA
– Power-down Mode: <1 µA
• I/O and Packages
– 11 Programmable I/O Lines, 8 Input Lines and a High-current LED Driver
– 28-lead PDIP, 32-lead TQFP, and 32-pad MLF
• Operating Voltages
– VCC: 1.8V - 5.5V for the ATtiny28V
– VCC: 2.7V - 5.5V for the ATtiny28L
• Speed Grades
– 0 - 1.2 MHz for the ATtiny28V
– 0 - 4 MHz For the ATtiny28L