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AN110

更新时间： 2024-10-29 03:18:47

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16-BIT PWM USING AN ON-CHIP TIMER

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AN110 数据手册

AN110

16-BIT PWM USING AN ON-CHIP TIMER

The example also configures the target board to

sample the PWM output using the on-chip ADC.

This DAC implementation may be used to evaluate

the C8051F220/1/6’s ADC.

Relevant Devices

This application note applies to the following

devices:

C8051F000, C8051F001, C8051F002,

C8051F005, C8051F006, C8051F007,

C8051F010, C8051F011, C8051F012, C8051F015,

C8051F016, C8051F017, C8051F220,

C8051F221, C8051F226, C8051F230,

C8051F231, and C8051F236.

Key Points

•

The C8051F2xx family SoC’s feature three on-

board 16-bit timers that can be used for PWM

generation. This example uses Timer 0 to pro-

duce the PWM wave which is output to a gen-

eral-purpose port pin.

Note: the C8051F0xx devices have an on-chip

PCA which may be more suitable for PWM gener-

ation. See AN007 for more information.

•

The C8051F2xx family of SoC’s have an 8-bit

ADC that is used in the provided example to

sample the output of the PWM DAC.

The C8051F226-TB target board features a

low-pass filter that can readily be used for the

PWM DAC and configured to be sampled by

the on-chip ADC without soldering or adding

extra wiring. Target board use is assumed in the

provided example.

Introduction

This document describes how to implement a 16-

bit pulse width modulator (PWM) digital-to-analog

converter (DAC). The PWM consists of two parts:

1. A timer to produce a PWM waveform of a

given period and specified duty cycle.

Generating the PWM Input

Waveform

2. A low-pass filter to convert the PWM wave to

an analog voltage level output.

Pulse-Width Modulation (PWM) is a method of

encoding data by varying the width of a pulse or

changing the duty cycle of a periodic waveform.

Adjusting the duty cycle of this waveform, we con-

trol the voltage output from the low-pass filter. This

can be thought of as a type of digital-to-analog con-

vertor (DAC). In this example, we use Timer 0 to

time the toggling of a general purpose port pin to

create the PWM waveform.

A PWM coupled with a low-pass filter can be used

as a simple, low cost digital to analog converter

(DAC). This output can be used to drive to a volt-

age controlled device, or used in a feedback control

system where an analog-to-digital convertor

(ADC) is used to sample a controlled parameter.

PWM’s are often used in motor control applica-

tions.

Configuring Timer 0

Implementation software and hardware is dis-

cussed in this application note. An example of a

PWM using an on-chip timer and a low-pass filter

on the C8051F226-TB target board is provided.

In order to create a PWM wave with a user speci-

fied duty cycle, we use Timer 0 in 16-bit counter/

timer mode. To do so, we configure the Timer

Rev. 1.2 12/03

AN110-DS12

12 3 4 5 6 7...12

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