Multi-Pin Configuration

The multi-pin configuration function can 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, allowing changing the configuration (PORTx.PINnCTRL) for up to eight pins in one write.
Tip: The PORTx.PINCONFIG register is mirrored on all ports, allowing the use of a single setting across multiple ports. The PORTx.PINCTRLUPD/SET/CLR registers are not mirrored and must be applied to each port.
For the multi-pin configuration, port pins can be configured and modified by writing to the following registers.
Table 1. Multi-Pin Configuration Registers
Register Description
PORTx.PINCONFIG PINnCTRL (ISC, PULLUPEN, INLVL 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
Notes:
  1. 1.Using PINCTRLSET to configure nonzero ISC bit fields will result in a bitwise OR with the PINCONFIG and PINnCTRL registers and may give an unexpected setting.
  2. 2.Using PINCTRLCLR to configure nonzero ISC bit fields will result in a bitwise inverse AND with the PINCONFIG and PINnCTRL registers and may give an unexpected setting.

The following code snippet demonstrates how to configure multiple PINnCTRL registers of several ports. Note that, 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;