atmega328p-20mu ATMEL Corporation, atmega328p-20mu Datasheet - Page 5

• Manufacturer Part Number: atmega328p-20mu
• Description: Atmega88p 8-bit Microcontroller With 8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

2. Overview
2.1
8025DS–AVR–03/08
Block Diagram
The ATmega48P/88P/168P/328P 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
ATmega48P/88P/168P/328P achieves throughputs approaching 1 MIPS per MHz allowing the
system designer to optimize power consumption versus processing speed.
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
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
ATmega48P/88P/168P/328P
Comp.
Flash
PB[0..7]
SPI
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