ATtiny87-15XZ datasheet(2/282 Pages) ATMEL

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7728D–AVR–07/09

ATtiny87/ATtiny167

Description

1.1

Comparison Between ATtiny87 and ATtiny167

ATtiny87 and ATtiny167 are hardware and software compatible. They differ only in memory

sizes as shown in Table 1-1.

1.2

Part Description

The ATtiny87/167 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 ATtiny87/167

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 inde-

pendent 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 ATtiny87/167 provides the following features: 8K/16K byte of In-System Programmable

Flash, 512 bytes EEPROM, 512 bytes SRAM, 16 general purpose I/O lines, 32 general pur-

pose working registers, one 8-bit Timer/Counter with compare modes, one 8-bit high speed

Timer/Counter, Universal Serial Interface, a LIN controller, Internal and External Interrupts, a

11-channel, 10-bit ADC, a programmable Watchdog Timer with internal 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 function-

ing. The Power-down mode saves the register contents, 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.

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 Boot program can use any interface to download the appli-

cation program in the Flash memory. By combining an 8-bit RISC CPU with In-System

Self-Programmable Flash on a monolithic chip, the Atmel ATtiny87/167 is a powerful micro-

controller that provides a highly flexible and cost effective solution to many embedded control

applications.

The ATtiny87/167 AVR is supported with a full suite of program and system development tools

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

tors, and Evaluation kits.

Table 1-1.

Memory Size Summary

Device

Flash

EEPROM

SRAM

Interrupt Vector size

ATtiny167

16K Bytes

512 Bytes

2-instruction-words / vector

ATtiny87

8K Bytes

512 Bytes

2-instruction-words / vector

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