32.8.1 Data Direction

Important: For SAM L11 Non-Secure accesses, read and write write accesses (RW*) are allowed only if the security attribution for the corresponding I/O pin is set as Non-Secured in the NONSEC register.

This register allows the user to configure one or more I/O pins as an input or output. This register can be manipulated without doing a read-modify-write operation by using the Data Direction Toggle (DIRTGL), Data Direction Clear (DIRCLR) and Data Direction Set (DIRSET) registers.

Tip: The I/O pins are assembled in pin groups (”PORT groups”) with up to 32 pins. Group 0 consists of the PA pins, group 1 is for the PB pins, etc. Each pin group has its own PORT registers, with a 0x80 address spacing. For example, the register address offset for the Data Direction (DIR) register for group 0 (PA00 to PA31) is 0x00, and the register address offset for the DIR register for group 1 (PB00 to PB31) is 0x80.

Name:	DIR
Offset:	0x00
Reset:	0x00000000
Property:	PAC Write-Protection, Mix-Secure


Bit	31	30	29	28	27	26	25	24
	DIR[31:24]
Access	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	DIR[23:16]
Access	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	DIR[15:8]
Access	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	DIR[7:0]
Access	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW	RW/RW*/RW
Reset	0	0	0	0	0	0	0	0

Bits 31:0 – DIR[31:0] Port Data Direction

These bits set the data direction for the individual I/O pins in the PORT group.

Value	Description
0	The corresponding I/O pin in the PORT group is configured as an input.
1	The corresponding I/O pin in the PORT group is configured as an output.