AN1504/0302

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AN1504

APPLICATION NOTE

STARTING A PWM SIGNAL DIRECTLY

AT HIGH LEVEL USING THE ST7 16-BIT TIMER

by Microcontroller Division Applications

INTRODUCTION

The 16-bit timer is a standard peripheral of the ST7 microcontroller family. This peripheral can

be used for a variety of purposes, including pulse length measurement of up to two input sig-

nals (input capture feature) or generation of up to two output waveforms (output compare and

PWM mode).

This application note is about using the PWM mode of the standard 16 bit timer. It explains

how to synchronize the PWM signal output. In other words, how to make sure it outputs a high

state when the counter restarts after it has been stopped (for any reason) or simply when it

starts at the beginning of the application. In some applications, like motor control, it may be es-

sential to output the high level part of the signal duty cycle when the counter is started.

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