TMS320F241FN datasheet(32/66 Pages) TI

32 / 66 page

TMS320C242

DSP CONTROLLER

SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

general-purpose (GP) timers

There are two GP timers on the TMS320x24x. The GP timer x (for x = 1 or 2) includes:

D A 16-bit timer, up-/down-counter, TxCNT, for reads or writes

D A 16-bit timer-compare register, TxCMPR (double-buffered with shadow register), for reads or writes

D A 16-bit timer-period register, TxPR (double-buffered with shadow register), for reads or writes

D A 16-bit timer-control register,TxCON, for reads or writes

D Selectable internal or external input clocks

D A programmable prescaler for internal or external clock inputs

D Control and interrupt logic, for four maskable interrupts: underflow, overflow, timer compare, and period

interrupts

D A selectable direction input pin (TDIR) (to count up or down when directional up-/down-count mode is

selected)

The GP timers can be operated independently or synchronized with each other. The compare register

associated with each GP timer can be used for compare function and PWM-waveform generation. There are

three continuous modes of operations for each GP timer in up- or up / down-counting operations. Internal or

external input clocks with programmable prescaler is used for each GP timer. GP timers also provide the time

base for the other event-manager submodules: GP timer 1 for all the compares and PWM circuits, GP timer 2/1

for the capture units and the quadrature-pulse counting operations.

Double-buffering of the period and compare registers allows programmable change of the timer (PWM) period

and the compare/PWM pulse width as needed.

full-compare units

There are three full-compare units on TMS320x24x. These compare units use GP timer1 as the time base and

generate six outputs for compare and PWM-waveform generation using programmable deadband circuit. The

state of each of the six outputs is configured independently. The compare registers of the compare units are

double-buffered, allowing programmable change of the compare/PWM pulse widths as needed.

programmable deadband generator

The deadband generator circuit includes three 8-bit counters and an 8-bit compare register. Desired deadband

values (from 0 to 24

ms) can be programmed into the compare register for the outputs of the three compare units.

The deadband generation can be enabled/disabled for each compare unit output individually. The

deadband-generator circuit produces two outputs (with or without deadband zone) for each compare unit output

signal. The output states of the deadband generator are configurable and changeable as needed by way of the

double-buffered ACTR register.

PWM waveform generation

Up to 8 PWM waveforms (outputs) can be generated simultaneously by TMS320x24x: three independent pairs

(six outputs) by the three full-compare units with

programmable deadbands, and two independent PWMs by

the GP-timer compares.

TMS320F241FN Datasheet(PDF) 32 Page - Texas Instruments

TMS320F241FN Datasheet(HTML) 32 Page - Texas Instruments

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