Atmel / Microchip ATmega644PA 8-bit AVR® Microcontrollers

Microchip ATmega644PA 8-bit AVR^® CMOS Microcontrollers are low-power and based on the AVR^® enhanced RISC architecture. The Atmel ATmega644PA is a powerful 8-bit microcontroller, that offers excellent flexibility and a cost-effective solution to a wide range of embedded control applications.

The ATmega644PA produces throughputs close to 1MIPS per MHz, by using up to 131 powerful instructions in a single clock cycle. Using this process, the designer can optimize the ATmega644PA for power consumption versus processing speed. The 32x8 general-purpose working registers with an extensive instruction set are combined in the Atmel AVR^® core.

The 32 general-purpose working registers are directly connected to the Arithmetic Logic Unit (ALU). This allows two independent registers to be accessed in a single instruction and executed in one clock cycle to achieve throughputs up to ten times faster than conventional CISC microcontrollers.

Features

Advanced RISC architecture
- 131 Powerful instructions
- Most single clock cycle execution
- 32 x 8 General purpose working registers
- Fully static operation
- Up to 20MIPS throughput at 20MHz
- On-chip 2-cycle multiplier
High endurance non-volatile memory segments
- 64KBytes of In-system self-programmable flash program
Memory
- 2KBytes EEPROM
- 4KBytes Internal SRAM
- Write/Erase cycles: 10,000 Flash/100,000 EEPROM
- Data retention: 20 years at 85°C/100 years at 25°C
- Optional boot code section with independent lock bits
In-system programming by an on-chip boot program
True Read-While-Write Operation
- Programming Lock for Software Security
Atmel QTouch^® Library Support
- Capacitive Touch Buttons, Sliders, and Wheels
- QTouch and QMatrix acquisition
- Up to 64 Sense Channels
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
32 Programmable I/O Lines
Packages: 40-pin PDIP, 44-lead TQFP, 44-pad VQFN/QFN

Peripheral
- 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
- 6 PWM Channels
- 8-channel 10-bit ADC
Differential Mode with Selectable Gain at 1×, 10× or 200×
- 1 Byte-oriented 2-wire Serial Interface (Philips I2C compatible)
- 2 Programmable Serial USART
- 1 Master/Slave SPI Serial Interface
- Programmable Watchdog Timer with Separate On-chip Oscillator
- On-chip Analog Comparator
- Interrupt and Wake-up on Pin Change
Power-on Reset and Programmable Brown-out Detection
Internal Calibrated RC Oscillator
External and Internal Interrupt Sources
6 Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
Speed Grades
- 0 - 4MHz @ 1.8V - 5.5V
- 0 - 10MHz @ 2.7V - 5.5V
- 0 - 20MHz @ 4.5 - 5.5V
Power Consumption at 1MHz, 1.8V, 25°C
- Active Mode: 0.4mA
- Power-down Mode: 0.1μA
- Power-save Mode: 0.6μA (Including 32kHz RTC)
Operating Voltage: 1.8V to 5.5V