Описание
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 Microchip ATmega48/88/168 provides the following features: 4K/8K/16Kbytes of in-system programmable flash with read-while-write capabilities, 256/512/512 bytes EEPROM, 512/1K/1Kbytes SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with compare modes, internal and external interrupts, a serial programmable USART, a byte-oriented 2-wire serial interface, an SPI serial port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN packages), a programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire serial interface, SPI port, and interrupt system to continue functioning. The power-down mode saves the register contents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset. In power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC noise reduction mode stops the CPU and all I/O modules except asynchronous timer and 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. This allows very fast start-up combined with low power consumption.
- High performance, low power AVR® 8-bit microcontroller
- Advanced RISC architecture
- 131 powerful instructions –most single clock cycle execution
- 32 x 8 general purpose working registers
- Fully static operation
- Up to 16MIPS throughput at 16MHz
- On-chip 2-cycle multiplier
- Non-volatile program and data memories
- 4/8/16Kbytes of in-system self-programmable flash (ATmega48/88/168)
- Endurance: 75,000 write/erase cycles
- Optional boot code section with independent lock bits
- In-system programming by on-chip boot program
- True read-while-write operation
- 256/512/512 Bytes EEPROM (ATmega48/88/168)
- Endurance: 100,000 write/erase cycles
- 512/1K/1Kbyte internal SRAM (ATmega48/88/168)
- Programming lock for software security
- Peripheral features
- Two 8-bit Timer/Counters with separate prescaler and compare mode
- One 16-bit Timer/Counter with separate prescaler, compare mode, and capture mode
- Real time counter with separate oscillator
- Six PWM channels
- 8-channel 10-bit ADC
- Programmable serial USART
- Master/slave SPI serial interface
- Byte-oriented 2-wire serial interface
- Programmable watchdog timer with separate on-chip oscillator
- On-chip analog comparator
- Interrupt and wake-up on pin change
- Special microcontroller features
- Power-on reset and programmable brown-out detection
- Internal calibrated oscillator
- External and internal interrupt sources
- Five sleep modes: Idle, ADC noise reduction, power-save, power-down, and standby
