ST92F124 datasheet(188/429 Pages) STMICROELECTRONICS

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MULTIFUNCTION TIMER (MFT)

10.4 MULTIFUNCTION TIMER (MFT)

10.4.1 Introduction

The Multifunction Timer (MFT) peripheral offers

powerful timing capabilities and features 12 oper-

ating modes, including automatic PWM generation

and frequency measurement.

The MFT comprises a 16-bit Up/Down counter

driven by an 8-bit programmable prescaler. The in-

put clock may be INTCLK/3 or an external source.

The timer features two 16-bit Comparison Regis-

ters, and two 16-bit Capture/Load/Reload Regis-

ters. Two input pins and two alternate function out-

put pins are available.

Several functional configurations are possible, for

instance:

– 2 input captures on separate external lines, and

2 independent output compare functions with the

counter in free-running mode, or 1 output com-

pare at a fixed repetition rate.

– 1 input capture, 1 counter reload and 2 inde-

pendent output compares.

– 2 alternate autoreloads and 2 independent out-

put compares.

– 2 alternate captures on the same external line

and 2 independent output compares at a fixed

repetition rate.

When two MFTs are present in an ST9 device, a

combined operating mode is available.

An internal On-Chip Event signal can be used on

some devices to control other on-chip peripherals.

The two external inputs may be individually pro-

grammed to detect any of the following:

– rising edges

– falling edges

– both rising and falling edges

Figure 101. MFT Simplified Block Diagram

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