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8235AS–AVR–03/10

ATtiny20

The resulting architecture is compact and code efficient while achieving throughputs up to ten

times faster than conventional CISC microcontrollers.

The ATtiny20 provides the following features: 2K byte of In-System Programmable Flash, 128

bytes of SRAM, twelve general purpose I/O lines, 16 general purpose working registers, an 8-bit

Timer/Counter with two PWM channels, a 16-bit Timer/Counter with two PWM channels, Internal

and External Interrupts, an eight-channel, 10-bit ADC, a programmable Watchdog Timer with

internal oscillator, a slave two-wire interface, a master/slave serial peripheral interface, an inter-

nal calibrated oscillator, and four software selectable power saving modes.

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

and interrupt system to continue functioning. ADC Noise Reduction mode minimizes switching

noise during ADC conversions by stopping the CPU and all I/O modules except the ADC. In

Power-down mode registers keep their contents and all chip functions are disabled until the next

interrupt or hardware reset. In Standby mode, the oscillator is running while the rest of the

device is sleeping, allowing very fast start-up combined with low power consumption.

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

chip, in-system programmable Flash allows program memory to be re-programmed in-system by

a conventional, non-volatile memory programmer.

The ATtiny20 AVR is supported by a suite of program and system development tools, including

macro assemblers and evaluation kits.