PIC Timer 0 calculator

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PIC Timer 0 calculator

With the PIC Timer 0 calculator you can see the resulting frequencies and periods when you enter three bits of information. These are :

Frequency (default is 4MHz).
Prescaler ratio.
Timer 0 offset.

Jump to PIC Timer 1 calculator.
Jump to PIC Timer 2 calculator.

Jump to install plugin.

To be honest I got fed up with looking at the data sheet to figure out the prescaler and timer offset values - this program lets you get the results easily (There is a screenshot of the program further down the page if the runtime is not installed - and instructions on how to install it are also further down the page).

PIC Timer 0 hardware Block diagram [from 33023a.pdf]

PIC Timer 0 block diagram 33023a.pdf

PIC Timer 0 registers [from 16F88 datasheet DS30487B.pdf]
(Note these may be different in other devices)

Sidebar : Installing the tcl plugin

To operate the program below you need to install the tcl plugin - this is similar to the Java environment and once done you wont need to install it again to use the program on this page (or any other web page that has a tclet on it).

Note: I had forgotten how difficult Internet Explorer is to use and you can set up the tcl plugin manually if you want to but....

The easiest method is to install Firefox and then the tcl plugin through Firefox - Firefox is an excellent browser - and so much faster.

Note after installation you can use either browser.

After you install Firefox you can find the tcl plugin here [opens new window].

Note: If the download does not start then you can get the XPI plugin (for windows only) here - save the xpi file to a temporary location.

Then once you have installed Firefox just open the .XPI file (from within the Firefox browser: File->Open file) this will also set up Internet explorer for you (so you can use either browser).

Doing it this way is a push button process - extremely easy - plus you get a much better browser with tabbed browsing and easy plugin management plus a host of other features - it's free and it's faster.

Here's the actual program that you can use in this page: (If you don't see the program running you need to download the tclet runtime engine as described above - you only need to do this once).

PIC Timer 0 calculator

For the last two entries two sliders let you change the values by dragging a control up and down on the screen and the resulting changes are immediately shown in this page.

Note: For the example in 'Notes' (setting Timer 1 to count to 100) set 'Counts to OVFL' (overflow) to 100 to get the same result.

The program is a tclet (which is comparable to a java applet). You could ask why didn't I write it in Java - well I could have but TCL is a very powerful and easy to use language.

A little bit more on this - a reference I found on the Internet quotes :

A Tcl/Tk applet (called "tclet") is very compact compared to a similar Java implementation. A tclet can be produced in a few broad strokes, whereas Java insists that the applet designer spend considerably more time on the details of the interface and implementation.

Tclets are now easy to find and remarkable for their economy. A tclet underlines the difference in approach between Tcl and Java. The tclets are generally implemented with only about 150 lines of code; they leverage Tk's simplicity of expression effectively, and completely ignore the deeper software engineering that would be needed to construct a similar Java applet.

[source http://www.chez.com/chu/tcl.htm]

As an engineer I find these comments extremely relevant - why spend ages looking at extreme detail - engineering is about understanding what you need to know to get the job done - it's not about understanding all the extreme unnecessary detail - this encapsulates the philosophy of TCL and engineering.

Screen shot of PIC Timer 0 calculator in action

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