ATtiny102/ATtiny104 have one configuration byte, which resides in the configuration section.
| Configuration byte | Offset Address | Configuration word data | |
|---|---|---|---|
| CONFW0 | 0x04 | Configuration word (fuse values- RSTDISBL, WDTON, CKOUT, SELFPROGEN) | |
The next table briefly describes the functionality of all configuration bits and how they are mapped into the configuration byte.
| Bit | Fuse values | Description | Default Value |
|---|---|---|---|
| 7:4 | – | Reserved | 1 (unprogrammed) |
| 3 | SELFPROGEN | Self-Programming | 1 (unprogrammed) |
| 2 | CKOUT | System Clock Output | 1 (unprogrammed) |
| 1 | WDTON | Watchdog Timer always on | 1 (unprogrammed) |
| 0 | RSTDISBL | External Reset disable | 1 (unprogrammed) |
Configuration bits are not affected by a chip erase but they can be cleared using the configuration section erase command (see Erasing the Configuration Section in this chapter). Note that configuration bits are locked if Non- Volatile Lock Bit 1 (NVLB1) is programmed.