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8048BS–AVR–03/09

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATtiny43U provides the following features: 4K byte of In-System Programmable Flash, 64

bytes EEPROM, 256 bytes SRAM, 16 general purpose I/O lines, 32 general purpose working

registers, two 8-bit Timer/Counters with two PWM channels, Internal and External Interrupts, a

4-channel 10-bit ADC, Universal Serial Interface, a programmable Watchdog Timer with internal

Oscillator, internal calibrated oscillator, and three software selectable power saving modes. The

Idle mode stops the CPU while allowing the SRAM, Timer/Counter, ADC, Analog Comparator,

and Interrupt system to continue functioning. The Power-down mode saves the register con-

tents, disabling all chip functions until the next Interrupt or Hardware Reset. The ADC Noise

Reduction mode stops the CPU and all I/O modules except ADC, to minimize switching noise

during ADC conversions.

A special feature of ATtiny43U is the built-in boost voltage converter, which provides 3V supply

voltage from an external, low voltage.

The device is manufactured using Atmel’s high density non-volatile memory technology. The

On-chip ISP Flash allows the Program memory to be re-programmed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer or by an On-chip boot code

running on the AVR core.

The ATtiny43U AVR is supported by a full suite of program and system development tools

including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators,

and Evaluation kits.