CPU
CPURegisters
GPIOR00x3EGPIOR10x4AGPIOR20x4BSMCR0x53MCUSR0x54MCUCR0x55SPMCSR0x57SP0x5DSREG0x5FCLKPR0x61PRR00x64PRR10x65OSCCAL0x66
ATmega328PB peripherals
Each block of the ATmega328PB: what it is, the registers that control it and the pins it uses.
PORTB
PORTI/O Port
Registers
PORTC
PORTI/O Port
Registers
PORTD
PORTI/O Port
Registers
PORTE
PORTI/O Port
Registers
EXINT
EXINTRegisters
Pins
TC0
TC8Registers
Pins
TC1
TC16Registers
Pins
TC2
TC8_ASYNCTimer/Counter, 8-bit Async
Registers
Pins
TC3
TC16Registers
Pins
TC4
TC16Registers
Pins
USART0
USARTUSART
Registers
Pins
USART1
USARTUSART
Registers
Pins
SPI0
SPIRegisters
Pins
SPI1
SPIRegisters
Pins
TWI0
TWITwo Wire Serial Interface
Registers
Pins
TWI1
TWITwo Wire Serial Interface
Registers
Pins
ADC
ADCAnalog-to-Digital Converter