July 2008

Rev 2

1/5

AN591

Application note

Input capture with ST62 auto-reload timer

Introduction

This note presents how to use the Auto-reload timer (ARTimer) of the ST62 to measure

durations or frequencies of an input signal.

Auto-reload timer description

This timer is an 8 bit timer/counter with prescaler. It includes auto-reload PWM, capture and

compare capability with one input and one output pins. It can be controlled by the following

registers (8 bit):

●

Mode Control Register (MC)

●

Status registers (SC0, SC1)

●

Load register (LR)

●

Incremental counter register (TC)

●

Compare register (CP)

●

Reload/Capture register (RC)

It can also wake-up the MCU from wait mode and exit from stop mode if an external event is

present on the input pin. The prescaler ratio can be programmed to choose the timer input

frequency FIN (see Table 1).

Figure 1.

Auto-reload timer block diagram

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