ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 3

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2. Overview
2.1
Figure 2-1.
8011D–AVR–02/07
RESET
XTAL1
XTAL2
Block Diagram
VCC
GND
Block Diagram
POR / BOD &
Supervision
Generation
Watchdog
Watchdog
Oscillator
Oscillator
Circuits /
RESET
Power
Timer
Clock
TOSC2/PC7
The ATmega164P/324P/644P 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
ATmega164P/324P/644P achieves throughputs approaching 1 MIPS per MHz allowing the sys-
tem designer to optimize power consumption versus processing speed.
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 con-
ventional CISC microcontrollers.
TOSC1/PC6
JTAG/OCD
PORT C (8)
EEPROM
Converter
TWI
PC5..0
A/D
PORT A (8)
PA7..0
FLASH
Bandgap reference
Internal
CPU
SRAM
ATmega164P/324P/644P
Comparator
Analog
PORT B (8)
8bit T/C 0
PORT D (8)
16bit T/C 1
8bit T/C 2
PB7..0
PD7..0
SPI
USART 0
USART 1
3