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Features

Utilizes the AVR ® Enhanced RISC Architecture

AVR – High Performance and Low Power RISC Architecture

118 Powerful Instructions – Most Single Clock Cycle Execution

8K bytes of In-System Programmable Flash AT90S/LS8535

4K bytes of In-System Programmable Flash AT90S/LS4434

– SPI Serial Interface for In-System Programming

– Endurance: 1,000 Write/Erase Cycles

512 bytes EEPROM AT90S/LS8535

256 bytes EEPROM AT90S/LS4434

– Endurance: 100,000 Write/Erase Cycles

512 bytes Internal SRAM AT90S/LS8535

256 bytes Internal SRAM AT90S/LS4434

8-Channel, 10-Bit ADC

32 x 8 General Purpose Working Registers

32 Programmable I/O Lines

Programmable Serial UART

VCC: 4.0 – 6.0V AT90S4434/AT90S8535

VCC: 2.7 – 6.0V AT90LS4434/AT90LS8535

Speed Grades:

0 – 8 MHz AT90S4434/AT90S8535,

0 – 4 MHz (AT90LS4434/AT90LS8535

Power-On Reset Circuit

Up to 8 MIPS Throughput at 8 MHz

RTC with Separate Oscillator and Counter Mode

Two 8-Bit Timer/Counters with Separate Prescaler and Compare Mode

One 16-Bit Timer/Counter with Separate Prescaler and Compare and Capture Modes

3 PWM channels

External and Internal Interrupt Sources

Programmable Watchdog Timer with On-Chip Oscillator

On-Chip Analog Comparator

Three Sleep Modes: Idle, Power Save, and Power Down

Programming Lock for Software Security

8-Bit Microcontroller with 4K/8K Bytes In-System Programmable Flash

Description

The AT90S4434/8535 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 AT90S4434/8535 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing.