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.

The device is a complex microcontroller with more peripheral units than can be supported within the 64 locations reserved in Opcode for the IN and OUT instructions. For the extended I/O space from 0x60 in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.

Name:
DDRB
Offset:
0x24
Reset:
0x00
Access:
When addressing as I/O Register: address offset is 0x04
Bit76543210
DDRB7DDRB6DDRB5DDRB4DDRB3DDRB2DDRB1DDRB0
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000

Bits 0, 1, 2, 3, 4, 5, 6, 7 – DDRB: Port B Data Direction

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.