AVR

The AT89C55WD is a low-power, high-performance CMOS 8-bit microcontroller with

20K bytes of Flash programmable read only memory and 256 bytes of RAM. The

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

and is compatible with the industry standard 80C51 and 80C52 instruction set and

pinout. The on-chip Flash allows the program memory to be user programmed by a

conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU

with Flash on a monolithic chip, the Atmel AT89C55WD is a powerful microcomputer

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

applications.

The AT89C55WD provides the following standard features: 20K bytes of Flash, 256

bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector, two-level interrupt

architecture, a full-duplex serial port, on-chip oscillator, and clock circuitry. In addition,

the AT89C55WD is designed with static logic for operation down to zero frequency

and supports two software selectable power saving modes. The Idle Mode stops the

CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue

functioning. The Power-down Mode saves the RAM contents but freezes the

oscillator, disabling all other chip functions until the next external interrupt or hardware

reset.

test

ATmega8A micro controller

Features:

1. High-performance, Low-power Atmel® , AVR,®, 8-bit Microcontroller

2., Advanced RISC Architecture

3. 130 Powerful Instruct, ions – Most Single-clock Cycle Execution

4. 32 x 8 General Purpose Working Registers

5. Fully Static Operation

6. Up to 16MIPS Throughput at 16MHz

7. On-chip 2-cycle Multiplier

• High Performance, Low Power AVR® 8-Bit Microcontroller
• Advanced RISC Architecture
– 120 Powerful Instructions – Most Single Clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
– Up to 20 MIPS Througput at 20 MHz
• High Endurance Non-volatile Memory segments
– 1K Bytes of In-System Self-programmable Flash program memory
– 64 Bytes EEPROM
– 64 Bytes Internal SRAM
– Write/Erase cyles: 10,000 Flash/100,000 EEPROM
– Data retention: 20 years at 85°C/100 years at 25°C (see page 6)
– Programming Lock for Self-Programming Flash & EEPROM Data Security
• Peripheral Features
– One 8-bit Timer/Counter with Prescaler and Two PWM Channels
– 4-channel, 10-bit ADC with Internal Voltage Reference
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
• Special Microcontroller Features
– debugWIRE On-chip Debug System
– In-System Programmable via SPI Port
– External and Internal Interrupt Sources
– Low Power Idle, ADC Noise Reduction, and Power-down Modes
– Enhanced Power-on Reset Circuit
– Programmable Brown-out Detection Circuit
– Internal Calibrated Oscillator
• I/O and Packages
– 8-pin PDIP/SOIC: Six Programmable I/O Lines
– 20-pad MLF: Six Programmable I/O Lines
• Operating Voltage:
– 1.8 – 5.5V for ATtiny13V
– 2.7 – 5.5V for ATtiny13
• Speed Grade
– ATtiny13V: 0 – 4 MHz @ 1.8 – 5.5V, 0 – 10 MHz @ 2.7 – 5.5V
– ATtiny13: 0 – 10 MHz @ 2.7 – 5.5V, 0 – 20 MHz @ 4.5 – 5.5V
• Industrial Temperature Range
• Low Power Consumption
– Active Mode:
• 1 MHz, 1.8V: 240 μA