ATMEGA644PA-PU Atmel, ATMEGA644PA-PU Datasheet - Page 574

• Manufacturer Part Number: ATMEGA644PA-PU
• Description: IC MCU 8BIT 64KB FLASH 40DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644PA-PU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, TWI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8272A–AVR–01/10
9
10 System Control and Reset .................................................................... 51
11 Interrupts ................................................................................................ 62
12 External Interrupts ................................................................................. 68
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Power Management and Sleep Modes ................................................. 43
8.3Low Power Crystal Oscillator ...................................................................................33
8.4Full Swing Crystal Oscillator ....................................................................................34
8.5Low Frequency Crystal Oscillator ............................................................................35
8.6Calibrated Internal RC Oscillator .............................................................................37
8.7128 kHz Internal Oscillator ......................................................................................38
8.8External Clock .........................................................................................................38
8.9Timer/Counter Oscillator .........................................................................................39
8.10Clock Output Buffer ...............................................................................................39
8.11System Clock Prescaler ........................................................................................40
8.12Register Description ..............................................................................................41
9.1Overview .................................................................................................................43
9.2Sleep Modes ...........................................................................................................43
9.3BOD Disable
9.4Idle Mode .................................................................................................................44
9.5ADC Noise Reduction Mode ...................................................................................44
9.6Power-down Mode ..................................................................................................45
9.7Power-save Mode ...................................................................................................45
9.8Standby Mode .........................................................................................................45
9.9Extended Standby Mode .........................................................................................45
9.10Power Reduction Register .....................................................................................46
9.11Minimizing Power Consumption ............................................................................46
9.12Register Description ..............................................................................................48
10.1Resetting the AVR .................................................................................................51
10.2Internal Voltage Reference ....................................................................................55
10.3Watchdog Timer ....................................................................................................56
10.4Register Description ..............................................................................................59
11.1Overview ...............................................................................................................62
11.2Interrupt Vectors in ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P ..
11.3Register Description ..............................................................................................66
12.1Overview ...............................................................................................................68
62
(1)
.........................................................................................................44
ii