Описание
The ATmega644P 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 ATmega644P achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.
- High-performance, Low-power Atmel® 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 20 MHz ?
- On-chip 2-cycle Multiplier
- High Endurance Non-volatile Memory segments ?
- 16K/32K/64K Bytes of In-System Self-programmable Flash program memory ?
- 512B/1K/2K Bytes EEPROM ?
- 1K/2K/4K Bytes Internal SRAM ?
- Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM ?
- Data retention: 20 years at 85°C/100 years at 25°C(1) ?
- 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 1×, 10× or 200× ?
- Byte-oriented Two-wire Serial Interface ?
- Two 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.
