> For the complete documentation index, see [llms.txt](https://mwx.twelite.info/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mwx.twelite.info/latest_en/api-reference/funcs/systemfunc.md).

# System Functions

- [millis()](https://mwx.twelite.info/latest_en/api-reference/funcs/systemfunc/millis.md): Obtain the system time, \[ms].
- [delay()](https://mwx.twelite.info/latest_en/api-reference/funcs/systemfunc/delay.md): Waiting for time by polling.
- [delayMicroseconds()](https://mwx.twelite.info/latest_en/api-reference/funcs/systemfunc/delaymicroseconds.md): Wait for time by polling (specified in μsec).
- [random()](https://mwx.twelite.info/latest_en/api-reference/funcs/systemfunc/random.md): Generates an random number.