`0x5E` is, in binary `01011110`, and the bits start (0-indexed) from the right (least significant bit).

`0x5E` is, in binary `01011110`, and the bits start (0-indexed) from the right (least significant bit).

The last four bits are about the clock selection, and their default `0010` stands for the 8MHz internal RC oscillator as source of the clock.

Or in a table:

In our program above, we're using `1110`, which we can understand by looking at the section on the clock (chapter 6, notably [page 24](http://fab.cba.mit.edu/classes/863.09/people/ryan/week5/ATtiny44%20Data%20Sheet.pdf#page=24)):

| `CKDIV8` | 0 |

| -------- | - |

| `CKOUT` | 1 |

| `SUT1` | 0 |

| `SUT0` | 1 |

| `CKSEL3` | 1 |

| `CKSEL2` | 1 |

| `CKSEL1` | 1 |

| `CKSEL0` | 0 |

The last four bits are about the clock selection, and their default value `0010` stands for the 8MHz internal RC oscillator as source of the clock.

In our program above, we're using `1110`, which we can understand by looking at the section on the clock (chapter 6, notably [page 24](http://fab.cba.mit.edu/classes/863.09/people/ryan/week5/ATtiny44%20Data%20Sheet.pdf#page=24), or just *search* for the fuse names):