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There are two types of timers: Hardware and Software.
Hardware timer is a small logic circuit with small piece of specific crystal which generate pulse at specific frequency. The problem with this kind of timer is that there are only a few of them in computer boards (some decades they did not use timer at all and instead electrical lines there used which was running precisely at 50Hz) and you might want to have more timers in your system. And here comes the software timer. Software timer is a descriptor in global timers table where all timers are checked every time hardware timer is triggered.
For example you have table (let it be your global timer table):
|Timer Id|Pointer to function|Time out|Init. value|Loop|
| 1 | checkIO | 1000 | 1000 |No |
| 2 | CleanBuffer | 9000 | 9000 |Yes |
| ....
Note: "Time out" and "Init. value" is in milliseconds.
Let's say my hardware timer is running at 1MHz, which means it is triggered a thousand times a second. Each time hardware timer is triggered I will be checking table to see if "Time out" column is equal to zero, if so I call function which pointer I have saved in "Pointer to function" column. If "Loop" is Yes "Time out" column is set to "Init. value". If "Loop" is No timer record from global timers table is removed.
This is very simple implementation of software timer. This was used only for example to better understand the difference of hardware and software timers.
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