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.
The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The AT90S4434/8535 provides the following features: 4K/8K bytes of In-System Programmable Flash, 256/512 bytes EEPROM, 256/512 bytes SRAM, 32 general purpose I/O lines, 32 general purpose working registers, RTC, three flexible timer/counters with compare modes, internal and external interrupts, a programmable serial UART, 8-channel, 10-bit ADC, programmable Watchdog Timer with internal oscillator, an SPI serial port and three software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, timer/counters, SPI port and interrupt system to continue functioning. The Power Down mode saves the register contents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset. In Power Save mode, the timer oscillator continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping.
The device is manufactured using Atmel's high density non-volatile memory technology. The on-chip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining an 8-bit RISC CPU wi
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• 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
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