Описание
The AVR core combines a rich instruction set with 32 general purpose working registers. All 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 ATtiny261A/461A/861A provides the following features: 2/4/8K byte of In-System Programmable Flash, 128/256/512 bytes EEPROM, 128/256/512 bytes SRAM, 16 general purpose I/O lines, 32 general purpose working registers, an 8-bit Timer/Counter with compare modes, an 8- bit high speed Timer/Counter, a Universal Serial Interface, Internal and External Interrupts, an 11-channel, 10-bit ADC, a programmable Watchdog Timer with internal 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. Powerdown mode saves the register contents, disabling all chip functions until the next Interrupt or Hardware Reset. ADC Noise Reduction mode stops the CPU and all I/O modules except ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator 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 Microchip’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.
- High Performance, Low Power AVR® 8-Bit Microcontroller
- Advanced RISC Architecture
- 123 Powerful Instructions –Most Single Clock Cycle Execution
- 32 x 8 General Purpose Working Registers
- Fully Static Operation
- Up to 20 MIPS Throughput at 20 MHz
- High Endurance Non-volatile Memory Segments
- 2/4/8K Bytes of In-System Self-Programmable Flash Program Memory
- Endurance: 10,000 Write/Erase Cycles
- 128/256/512 Bytes of In-System Programmable EEPROM
- Endurance: 100,000 Write/Erase Cycles
- 128/256/512 Bytes of Internal SRAM
- Data retention: 20 Years at 85°C / 100 Years at 25°C
- In-System Programmable via SPI Port
- Programming Lock for Software Security
- Peripheral Features
- One 8/16-bit Timer/Counter with Prescaler
- One 8/10-bit High Speed Timer/Counter with Prescaler
- 3 High Frequency PWM Outputs with Separate Output Compare Registers
- Programmable Dead Time Generator
- 10-bit ADC
- 11 Single-Ended Channels
- 16 Differential ADC Channel Pairs
- 15 Differential ADC Channel Pairs with Programmable Gain (1x, 8x, 20x, 32x)
- On-Chip Analog Comparator
- Programmable Watchdog Timer with Separate On-Chip Oscillator
- Universal Serial Interface with Start Condition Detector
- Interrupt and Wake-up on Pin Change
- Special Microcontroller Features
- debugWIRE On-Chip Debug System
- Power-on Reset and Programmable Brown-out Detection
- Internal Calibrated Oscillator
- External and Internal Interrupt Sources
- Four Sleep Modes: Low Power Idle, ADC Noise Reduction, Standby and PowerDown
- On-Chip Temperature Sensor
- I/O and Packages
- 16 Programmable I/O Lines
- 20-pin PDIP, 20-pin SOIC, 20-pin TSSOP and 32-pad MLF
- Operating Voltage
- 1.8 –5.5V
- Speed Grades
- 0 –4 MH–@ 1.8 –5.5V
- 0 –10 MH–@ 2.7 –5.5V
- 0 –20 MH–@ 4.5 –5.5V
- Power Consumption at 1 MHz, 1.8V, 25°C
- Active: 200 µA
- Power-Down Mode: 0.1 µA
