2.4.1.1 GPIO Basic Functionality
The megaAVR and AVR Dx families are not pin-to-pin compatible. Thus, the GPIO basic functionality is similar and is configurable using three registers for both families:
| megaAVR® | AVR® Dx | Description |
|---|---|---|
| DDRx | PORTx.DIR | Data direction - controls the data direction (output driver) |
| PORTx | PORTx.OUT | Data out - controls the output driver level for each PORTx pin |
| PINx | PORTx.IN | Data in - shows the state of the PORTx pin |
The following code snippets show how to configure the PORTA pin 7 as output-driven high for each family.
megaAVR® - Port A, Pin 7 Configured as Output and Driven High
{
DDRA = 0x80;
PORTA = 0x80;
}
AVR® Dx - Port A, Pin 7 Configured as Output and Driven High
{
PORTA.DIR = 0x80;
PORTA.OUT = 0x80;
}