Datasheet ATmega328/P - Summary (Microchip) - 8

4. Block Diagram Figure 4-1. Block Diagram SRAM debugWire CPU
OCD
Clock generation
PB[7:0] XTAL1 /
8MHz I/O
TOSC1 PC[6:0]
32.768kHz Calib RC NVM I PORTS
PD[7:0]
XOSC programming FLASH N External / clock
XTAL2 /
O
TOSC2
16MHz LP Power U 128kHz int XOSC GPIOR[2:0] osc management T and clock D EEPROM
T0 PD4
A D TC 0 control
OC0A PD6
T A (8-bit)
OC0B PD5
A T B A
VCC MISO0 PB4
U EEPROMIF B
MOSI0 PB3
Power SPI 0 S U
SCK0 PB5
Watchdog Supervision S
SS0 PB2 RESET
Timer POR/BOD &
AIN0 PD6
RESET AC
AIN1 PD7 GND
Internal
ADCMUX ADC6, ADC7 ADC6,ADC7,PC[5:0] ADC[7:0]
Reference
PC[5:0]
ADC
AREF AREF RxD0 PCINT[23:0] PD0 PD[7:0], PC[6:0], PB[7:0]
EXTINT USART 0
TxD0 INT[1:0] PD1 PD3, PD2 XCK0 PD4 PB1, PB2 OC1A/B
TC 1
PD5 T1
(16-bit)
PB0 ICP1
TWI 0
SDA0 PC4 PC5 PB3 OC2A
TC 2
SCL0 PD3 OC2B
(8-bit async)
Atmel ATmega328/P [DATASHEET] 8 Atmel-42735B-328/P_Datasheet_Summary-11/2016 Document Outline Introduction Feature Table of Contents 1. Description 2. Configuration Summary 3. Ordering Information 3.1. ATmega328 3.2. ATmega328P 4. Block Diagram 5. Pin Configurations 5.1. Pin-out 5.2. Pin Descriptions 5.2.1. VCC 5.2.2. GND 5.2.3. Port B (PB[7:0]) XTAL1/XTAL2/TOSC1/TOSC2 5.2.4. Port C (PC[5:0]) 5.2.5. PC6/RESET 5.2.6. Port D (PD[7:0]) 5.2.7. AVCC 5.2.8. AREF 5.2.9. ADC[7:6] (TQFP and VFQFN Package Only) 6. I/O Multiplexing 7. Resources 8. Data Retention 9. About Code Examples 10. Capacitive Touch Sensing 10.1. QTouch Library 11. Packaging Information 11.1. 32-pin 32A 11.2. 32-pin 32M1-A 11.3. 28-pin 28M1 11.4. 28-pin 28P3