debugWire Data 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:
DWDR
Offset:
0x51 [ID-000004d0]
Reset:
0x00
Access:
When addressing as I/O Register: address offset is 0x31
Bit76543210
DWDR[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000

Bits 7:0 – DWDR[7:0]: debugWire Data

debugWire Data

The DWDR Register provides a communication channel from the running program in the MCU to the debugger. This register is only accessible by the debugWIRE and can therefore not be used as a general purpose register in the normal operations.