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 1. Multi-Pin
Configuration Registers
| Register |
Description |
| PORTx.PINCONFIG |
PINnCTRL (ISC, PULLUPEN, INLVL
and INVEN) setting to load simultaneously to
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 PINCTRLCLRn register will clear
the individual bits in the PINnCTRL register,
according to the bits set to ‘1’
in the PINCONFIG register |
Notes:
- 1.Using
PINCTRLSET to configure ISC bit fields that are
non-zero will result in a bitwise OR with the
PINCONFIG and PINnCTRL registers. This may give an
unexpected setting.
- 2.Using
PINCTRLCLR to configure ISC bit fields that are
non-zero will result in a bitwise inverse AND with
the PINCONFIG and PINnCTRL registers. This may give
an unexpected setting.