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 speed.

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