ST7FOXK2 datasheet(117/226 Pages) STMICROELECTRONICS

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ST7FOXF1, ST7FOXK1, ST7FOXK2

On-chip peripherals

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10.4

16-bit timer

10.4.1

Introduction

The timer consists of a 16-bit free-running counter driven by a programmable prescaler.

It may be used for a variety of purposes, including pulse length measurement of up to two

input signals (input capture) or generation of up to two output waveforms (output compare

and PWM).

Pulse lengths and waveform periods can be modulated from a few microseconds to several

milliseconds using the timer prescaler and the CPU clock prescaler.

10.4.2

Main features

●

Programmable prescaler: fCPU divided by 2, 4 or 8.

●

Overflow status flag and maskable interrupt

●

External clock input (must be at least 4 times slower than the CPU clock speed) with

the choice of active edge

●

Output compare functions with

–

2 dedicated 16-bit registers

–

2 dedicated programmable signals

–

2 dedicated status flags

–

1 dedicated maskable interrupt

●

Input capture functions with

–

2 dedicated 16-bit registers

–

2 dedicated active edge selection signals

–

2 dedicated status flags

–

1 dedicated maskable interrupt

●

Pulse width modulation mode (PWM)

●

One pulse mode

●

Reduced power mode

●

5 alternate functions on I/O ports (ICAP1, ICAP2, OCMP1, OCMP2, EXTCLK)

Note:

Some timer pins may not be available (not bonded) in some devices. Refer to Section 2: Pin

description on page 15.

The block diagram is shown in Figure 55.

When reading an input signal on a non-bonded pin, the value is always ‘1’.

10.4.3

Functional description

Counter

The main block of the programmable timer is a 16-bit free running upcounter and its

associated 16-bit registers. The 16-bit registers are made up of two 8-bit registers called

high and low.

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