ATMEGA328P-20PU Atmel, ATMEGA328P-20PU Datasheet - Page 413

• Manufacturer Part Number: ATMEGA328P-20PU
• Manufacturer: Atmel

Specifications of ATMEGA328P-20PU

• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SPI/TWI/USART
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Total Internal Ram Size: 2KB
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 6-chx10-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 28
• Package Type: PDIP
• Lead Free Status / Rohs Status: Compliant

8025K–AVR–10/09
9
10 System Control and Reset .................................................................... 46
11 Interrupts ................................................................................................ 57
12 External Interrupts ................................................................................. 67
Power Management and Sleep Modes ................................................. 39
8.8External Clock .........................................................................................................34
8.9Clock Output Buffer .................................................................................................35
8.10Timer/Counter Oscillator .......................................................................................35
8.11System Clock Prescaler ........................................................................................35
8.12Register Description ..............................................................................................37
9.1Sleep Modes ...........................................................................................................39
9.2BOD Disable ............................................................................................................40
9.3Idle Mode .................................................................................................................40
9.4ADC Noise Reduction Mode ...................................................................................40
9.5Power-down Mode ..................................................................................................41
9.6Power-save Mode ...................................................................................................41
9.7Standby Mode .........................................................................................................41
9.8Extended Standby Mode .........................................................................................41
9.9Power Reduction Register .......................................................................................42
9.10Minimizing Power Consumption ............................................................................42
9.11Register Description ..............................................................................................44
10.1Resetting the AVR .................................................................................................46
10.2Reset Sources .......................................................................................................46
10.3Power-on Reset .....................................................................................................47
10.4External Reset .......................................................................................................48
10.5Brown-out Detection ..............................................................................................48
10.6Watchdog System Reset .......................................................................................49
10.7Internal Voltage Reference ....................................................................................49
10.8Watchdog Timer ....................................................................................................50
10.9Register Description ..............................................................................................54
11.1Interrupt Vectors in ATmega48P ...........................................................................57
11.2Interrupt Vectors in ATmega88P ...........................................................................59
11.3Interrupt Vectors in ATmega168P .........................................................................62
11.4Register Description ..............................................................................................65
12.1Pin Change Interrupt Timing .................................................................................67
12.2Register Description ..............................................................................................68
ATmega48P/88P/168P
ii