# pic18f47q10-cnano-tmr0-8bit-cmp-int-bare

**Repository Path**: microchip-pic-avr-examples/pic18f47q10-cnano-tmr0-8bit-cmp-int-bare

## Basic Information

- **Project Name**: pic18f47q10-cnano-tmr0-8bit-cmp-int-bare
- **Description**: This repository provides a bare-metal code example for using TMR0 in 8-bit Mode with Periodic Interrupt. TMR0 will generate a compare interrupt every 100 ms, using LFINTOSC as clock source. A GPIO pin is toggled each time an interrupt occurs.
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-06-17
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

<div id="readme" class="Box-body readme blob js-code-block-container">
 <article class="markdown-body entry-content p-3 p-md-6" itemprop="This needs to locked down and 'never' changed"><p><a href="https://www.microchip.com" rel="nofollow"><img src="images/Microchip.png" alt="MCHP" width="300";"></a></p>


# PIC18F47Q10 Using TMR0 in 8-bit Mode with Periodic Interrupt

## Objective
This repository contains an example of bare-metal source code for TMR0 as described in [*TBxxxx - Getting Started with Timers/Counters on PIC18*](https://www.microchip.com/) document from Microchip.

<br>This example describes how to configure Timer0 in 8-bit mode and to generate a compare interrupt every 100 ms using LFINTOSC as clock source.
<br>A GPIO pin (the development board’s on-board LED) will be configured as output and toggled each time the interrupt occurs.
<br>Additionally, the main clock will use a separate clock source (HFINTOSC) and Timer0 will run asynchronously from the main clock.

## Related Documentation
- [TBxxxx - Getting Started with Timers/Counters on PIC18](http://www.microchip.com/)
- [PIC18-Q10 Product Family Page](https://www.microchip.com/design-centers/8-bit/pic-mcus/device-selection/pic18f-q10-product-family)
- [PIC18F47Q10 Data Sheet](http://ww1.microchip.com/downloads/en/DeviceDoc/40002043D.pdf)
- [PIC18F47Q10 Code Examples on GitHub](https://github.com/microchip-pic-avr-examples?q=pic18f47q10-cnano&type=&language=)

## Software Used
- MPLAB® X IDE 5.30 or newer [(microchip.com/mplab/mplab-x-ide)](http://www.microchip.com/mplab/mplab-x-ide)
- MPLAB® XC8 2.10 or newer [(microchip.com/mplab/compilers)](http://www.microchip.com/mplab/compilers)
- Microchip PIC18F-Q Series Device Support 1.3.89 or newer [(packs.download.microchip.com/)](https://packs.download.microchip.com/)

## Hardware Used
- PIC18F47Q10 Curiosity Nano [(DM182029)](https://www.microchip.com/Developmenttools/ProductDetails/DM182029)

## Setup
The PIC18F47Q10 Curiosity Nano Development Board is used as the test platform.

<br><img src="images/PIC18F47Q10_CNANO.png" width="600">

The following configurations must be made for this project:
- Clock
	– Oscillator Select: HFINTOSC
	– HF Internal Clock: 1 MHz
	– Clock Divider: 1
- TMR0
	- TMR0 Enabled
	- Clock Prescaler: 1:16
	- Postscaler: 1:1
	- Timer mode: 8-bit
	- Clock Source: LFINTOSC
	- Synchronization: disabled
	- Timer period: 100 ms
	- Timer interrupt: enabled
- Watchdog Timer: disabled
- Low-voltage Programming: enabled

|Pin           | Configuration      |
| :----------: | :----------------: |
|RE0 (LED0)    | Digital Output     |



## Operation
1. Connect the board to the PC.

2. Open the *pic18f47q10-cnano-tmr0-8bit-cmp-int-bare.X* project in MPLAB® X IDE.

3. Set *pic18f47q10-cnano-tmr0-8bit-cmp-int-bare* project as main project. Right click on the project in the *Projects* tab and click *Set as Main Project*:
<br><img src="images/TMR0-8bit-cmp-int-bare-main-project.png" width="600">

4. Select the *PIC18F47Q10 Curiosity Nano* in the *Hardware Tool* section of the project settings:
  - Right click on the project and click *Properties*;
  - Select the *PIC18F47Q10 Curiosity Nano* (click on the SN) in the *Hardware Tool* tab and then click *OK*:
<br><img src="images/TMR0-8bit-cmp-int-bare-tool-settings.png" width="600">


5. Program the project to the board: right click on the project and click *Make and Program Device*:
<br><img src="images/TMR0-8bit-cmp-int-bare-program.png" width="600">

Demo:
<br><img src="images/TMR0_8bit_cmp_int.gif">

## Summary

This project is an illustration for a basic use case based around TMR0.