CP3SP33SMSSLASHNOPB datasheet(334/407 Pages) TI1

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CP3SP33

SNOSCW5 – MAY 2013

www.ti.com

33 Dual Versatile Timer Units (VTU)

Each Versatile Timer Unit (VTU) contains four fully independent 16-bit timer subsystems. Each timer

subsystem can operate either as dual 8-bit PWM timers, as a single 16-bit PWM timer, or as a 16-bit

counter with 2 input capture channels. These timer subsystems offers an 8-bit clock prescaler to

accommodate a wide range of system frequencies.

Each of the two VTUs provided on the CP3SP33 offers the following features:

•

The VTU can be configured to provide:

–

Eight fully independent 8-bit PWM channels

–

Four fully independent 16-bit PWM channels

–

Eight 16-bit input capture channels

•

The VTU consists of four timer subsystems, each of which contains:

–

A 16-bit counter

–

Two 16-bit capture / compare registers

–

An 8-bit fully programmable clock prescaler

•

Each of the four timer subsystems can operate in the following modes:

–

Low power mode, i.e., all clocks are stopped

–

Dual 8-bit PWM mode

–

16-bit PWM mode

–

Dual 16-bit input capture mode

•

The VTU controls a total of eight I/O pins, each of which can function as either:

–

PWM output with programmable output polarity

–

Capture input with programmable event detection and timer reset

•

A flexible interrupt scheme with

–

Four separate system level interrupt requests

–

A total of 16 interrupt sources each with a separate interrupt pending bit and interrupt enable bit

33.1 VTU Functional Description

Each VTU is comprised of four timer subsystems. Each timer subsystem contains an 8-bit clock prescaler,

a 16-bit up-counter, and two 16-bit registers. Each timer subsystem controls two I/O pins which either

function as PWM outputs or capture inputs depending on the mode of operation. There are four system-

level interrupt requests, one for each timer subsystem. Each system-level interrupt request is controlled by

four interrupt pending bits with associated enable/disable bits. All four timer subsystems are fully

independent, and each may operate as a dual 8-bit PWM timer, a 16-bit PWM timer, or as a dual 16-bit

capture timer. Figure 33-1 shows the main elements of the VTU.

334

Dual Versatile Timer Units (VTU)

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