19.4.3 Port B Data Direction
Register
When addressing I/O Registers as data space using LD
and ST instructions, the provided offset must be used. When using the I/O specific
commands IN and OUT, the offset is reduced by 0x20, resulting in an I/O address offset
within 0x00 - 0x3F.
| Name: | DDRB |
| Offset: | 0x24 |
| Reset: | 0x00 |
| Property: | When addressing as I/O Register:
address offset is 0x04 |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| | DDRB7 | DDRB6 | DDRB5 | DDRB4 | DDRB3 | DDRB2 | DDRB1 | DDRB0 | |
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bits 0, 1, 2, 3, 4, 5, 6, 7 – DDRB Port B Data
Direction
This bit field
selects the data direction for the individual pins in the Port. When a Port is
mapped as virtual, accessing this bit field is identical to accessing the actual DIR
register for the Port.
