Описание
The ATmega644 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 ATmega644 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.
- High-performance, Low-power AVR® 8-bit Microcontroller
- Advanced RISC Architecture
- 131 Powerful Instructions
- Most Single-clock Cycle Execution
- 32 × 8 General Purpose Working Registers
- Fully Static Operation
- Up to 20 MIPS Throughput at 20MHz
- High Endurance Non-volatile Memory segments
- 64 Kbytes of In-System Self-programmable Flash program memory
- 2 Kbytes EEPROM
- 4 Kbytes Internal SRAM
- Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3)
- Data retention: 20 years at 85°C/100 years at 25°C(2)(3)
- Optional Boot Code Section with Independent Lock Bits
- In-System Programming by On-chip Boot Program
- True Read-While-Write Operation
- Programming Lock for Software Security
- JTAG (IEEE std. 1149.1 Compliant) Interface
- Boundary-scan Capabilities According to the JTAG Standard
- Extensive On-chip Debug Support
- Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
- Peripheral Features
- Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
- 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 Differential mode with selectable gain at 1x, 10x or 200x
- Byte-oriented Two-wire Serial Interface
- One Programmable Serial USART
- Master/Slave SPI 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 RC Oscillator
- External and Internal Interrupt Sources
- Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby
- I/O and Packages
- 32 Programmable I/O Lines
- 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF
- Speed Grades
- ATmega644V: 0 – 4MHz @ 1.8V – 5.5V, 0 – 10MHz @ 2.7V – 5.5V
- Power Consumption at MHz, 3V, 25·C
- Active: 240µA @ 1.8V, 1MHz
- Power-down Mode: 0.1µA @ 1.8V
