ATMEGA328P-20PU Atmel, ATMEGA328P-20PU Datasheet - Page 5

• 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

2.1
8025K–AVR–10/09
Block Diagram
Figure 2-1.
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.
The ATmega48P/88P/168P provides the following features: 4K/8K/16K bytes of In-System Pro-
grammable Flash with Read-While-Write capabilities, 256/512/512 bytes EEPROM,
512/1K/1K bytes SRAM, 23 general purpose I/O lines, 32 general purpose working registers,
three flexible Timer/Counters with compare modes, internal and external interrupts, a serial pro-
grammable USART, a byte-oriented, 2-wire Serial Interface, an SPI serial port, a 6-channel 10-
bit ADC (8 channels in TQFP and QFN/MLF packages), a programmable Watchdog Timer with
Block Diagram
Generation
PORT D (8)
Watchdog
Watchdog
Oscillator
Oscillator
8bit T/C 0
8bit T/C 2
USART 0
Circuits /
EEPROM
Timer
Clock
PD[0..7]
POR / BOD &
Supervision
PORT B (8)
16bit T/C 1
Analog
Power
RESET
Comp.
Flash
PB[0..7]
SPI
ATmega48P/88P/168P
CPU
debugWIRE
PORT C (7)
A/D Conv.
Bandgap
PROGRAM
Internal
SRAM
PC[0..6]
LOGIC
TWI
6
ADC[6..7]
2
AVCC
XTAL[1..2]
AREF
GND
RESET
5