21.9.1 Data Direction

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

Bit 3130292827262524 
 DIR[31:24] 
Access RWRWRWRWRWRWRWRW 
Reset 00000000 
Bit 2322212019181716 
 DIR[23:16] 
Access RWRWRWRWRWRWRWRW 
Reset 00000000 
Bit 15141312111098 
 DIR[15:8] 
Access RWRWRWRWRWRWRWRW 
Reset 00000000 
Bit 76543210 
 DIR[7:0] 
Access RWRWRWRWRWRWRWRW 
Reset 00000000 

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.

ValueDescription
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.