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ATtiny15L

1187DS–12/01

Description

The ATtiny15L is a low-power CMOS 8-bit microcontroller based on the AVR RISC

architecture. By executing powerful instructions in a single clock cycle, the ATtiny15L

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 ATtiny15L provides 1K byte of Flash, 64 bytes EEPROM, six general purpose I/O

lines, 32 general purpose working registers, two 8-bit Timer/Counters, one with high-

speed PWM output, internal oscillators, internal and external interrupts, programmable

Watchdog Timer, 4-channel 10-bit Analog-to-Digital Converter with one differential volt-

age input with optional 20x gain, and three software-selectable Power-saving modes.

The Idle mode stops the CPU wh ile a llowin g the ADC, analog comp arator,

Timer/Counters and interrupt system to continue functioning. The ADC Noise Reduction

mode facilitates high-accuracy ADC measurements by stopping the CPU while allowing

the ADC to continue functioning. The Power-down mode saves the register contents but

freezes the oscillators, disabling all other chip functions until the next interrupt or hard-

ware reset. The wake-up or interrupt on pin change features enable the ATtiny15L to be

highly responsive to external events, still featuring the lowest power consumption while

in the Power-saving modes.

The device is manufactured using Atmel’s high-density, nonvolatile memory technology.

By combining a RISC 8-bit CPU with Flash on a monolithic chip, the ATtiny15L is a pow-

erful microcontroller that provides a highly flexible and cost-efficient solution to many

embedded control applications. The peripheral features make the ATtiny15L particularly

suited for battery chargers, lighting ballasts and all kinds of intelligent sensor

applications.

The ATtiny15L AVR is supported with a full suite of program and system development

tools including macro assemblers, program debugger/simulators, In-circuit emulators

and evaluation kits.