ATML – AT89S51

Features

High Performance, Low Power AVR® 8-Bit Microcontroller

Advanced RISC Architecture – 120 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation

Non-volatile Program and Data Memories

• – 2/4/8K Bytes of In-System Programmable Program Memory Flash
• – 128/256/512 Bytes In-System Programmable EEPROM
• – 128/256/512 Bytes Internal SRAM
• – Programming Lock for Self-Programming Flash Program and EEPROM Data Security

Peripheral Features

– 8-bit Timer/Counter with Prescaler and Two PWM Channels

– 8-bit High Speed Timer/Counter with Separate Prescaler

• 2 High Frequency PWM Outputs with Separate Output Compare Registers
• Programmable Dead Time Generator

– USI – Universal Serial Interface with Start Condition Detector – 10-bit ADC

4 Single Ended Channels

2 Differential ADC Channel Pairs with Programmable Gain (1x, 20x)

Temperature Measurement

• – Programmable Watchdog Timer with Separate On-chip Oscillator
• – On-chip Analog Comparator

Special Microcontroller Features

• – debugWIRE On-chip Debug System
• – In-System Programmable via SPI Port
• – External and Internal Interrupt Sources
• – Low Power Idle, ADC Noise Reduction, and Power-down Modes
• – Enhanced Power-on Reset Circuit
• – Programmable Brown-out Detection Circuit
• – Internal Calibrated Oscillator

I/O and Packages

• – Six Programmable I/O Lines
• – 8-pin PDIP, 8-pin SOIC, 20-pad QFN/MLF, and 8-pin TSSOP (only ATtiny45/V)
• Operating Voltage
• – 1.8 – 5.5V for ATtiny25V/45V/85V
• – 2.7 – 5.5V for ATtiny25/45/85

Speed Grade

• – ATtiny25V/45V/85V: 0 – 4 MHz @ 1.8 – 5.5V, 0 – 10 MHz @ 2.7 – 5.5V
• – ATtiny25/45/85: 0 – 10 MHz @ 2.7 – 5.5V, 0 – 20 MHz @ 4.5 – 5.5V

Industrial Temperature Range

Low Power Consumption

• – Active Mode: 1 MHz, 1.8V: 300 µA
• – Power-down Mode: 0.1 µA at 1.8V