17.3.2.4 Multi-Pin Configuration

The multi-pin configuration function is used to configure multiple PORT pins in one operation. The wanted pin configuration is first written to the PORTx.PINCONFIG register, followed by a register write, with the selected pins to modify. This allows changing the configuration (PORTx.PINnCTRL) for up to eight pins in one write.

Tip: The PORTx.PINCONFIG register is mirrored on all ports, which allows the use of a single setting across multiple ports. The PORTx.PINCTRLUPD/SET/CLR registers are not mirrored and need to be applied to each port.

For the multi-pin configuration, PORT pins can be configured and modified by writing to the following registers.

Table 17-1. Multi-Pin Configuration Registers
Register	Description
PORTx.PINCONFIG	PINnCTRL (ISC, PULLUPEN and INVEN) setting to prepare simultaneous configuration of multiple PINnCTRL registers
PORTx.PINCTRLUPD	Writing a ‘`1`’ to bit n in the PINCTRLUPD register will copy the PINCONFIG register content to the PINnCTRL register
PORTx.PINCTRLSET⁽¹⁾	Writing a ‘`1`’ to bit n in the PINCTRLSET register will set the individual bits in the PINnCTRL register, according to the bits set to ‘`1`’ in the PINCONFIG register
PORTx.PINCTRLCLR⁽²⁾	Writing a ‘`1`’ to bit n in the PINCTRLCLR register will clear the individual bits in the PINnCTRL register, according to the bits set to ‘`1`’ in the PINCONFIG register

Note:

Using PINCTRLSET to configure non-zero ISC bit fields will result in a bitwise OR with the PINCONFIG and PINnCTRL registers, which may give an unexpected setting.
Using PINCTRLCLR to configure non-zero ISC bit fields will result in a bitwise inverse AND with the PINCONFIG and PINnCTRL registers, which may give an unexpected setting.

The following code snippet demonstrates how to configure multiple PINnCTRL registers, of multiple ports.

Important: Because the PINCONFIG register is mirrored across all the ports, it is enough to only write it once, for PORT A, in this example.

PORTA.PINCONFIG = PORT_ISC_INPUT_DISABLE_gc; /* The setting to load to the PINnCTRL registers */
PORTA.PINCTRLUPD = 0xff;
PORTB.PINCTRLUPD = 0xff;
PORTC.PINCTRLUPD = 0xff;
PORTD.PINCTRLUPD = 0xff;
PORTE.PINCTRLUPD = 0xff;