TMS320F240 datasheet(42/105 Pages) TI

42 / 105 page

TMS320C240, TMS320F240

DSP CONTROLLERS

SPRS042D – OCTOBER 1996 – REVISED NOVEMBER 1998

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

full compare units

There are three full compare units on TMS320x240. These compare units use GP timer1 as the timebase 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

value (from 0 to 102

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.

simple compares

TMS320x240 is equipped with three simple compares that can be used to generate three additional

independent compare or high-precision PWM waveforms. GP timer1 or 2 can be selected as the timebase for

the three simple compares. The states of the outputs of the three simple compares are configurable as

low-active,

high-active,

forced-low,

forced-high

independently.

Simple

compare

registers

are

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

the simple-compare outputs is configurable and changeable as needed by way of the double-buffered SACTR

compare / PWM waveform generation

Up to 12 compare and/or PWM waveforms (outputs) can be generated simultaneously by TMS320x240: three

independent pairs (six outputs) by the three full compare units with

programmable deadbands, three

independent compares or PWMs (three outputs) by the simple compares, and three independent compare and

PWMs (three outputs) by the GP-timer compares.

compare/PWMs characteristics

Characteristics of the compare / PWMs are as follow:

D 16-bit, 50-ns resolutions

D Programmable deadband for the PWM output pairs, from 0 to 102 ms

D Minimum deadband width of 50 ns

D Change of the PWM carrier frequency for PWM frequency wobbling as needed

D Change of the PWM pulse widths within and after each PWM period as needed

D External maskable power and drive-protection interrupts

D Pulse-pattern-generator circuit, for programmable generation of asymmetric, symmetric, and four-space

vector PWM waveforms

D Minimized CPU overhead using auto-reload of the compare and period registers

capture unit

The capture unit provides a logging function for different events or transitions. The values of the GP timer 2

counter and/or GP timer 3 counter are captured and stored in the two-level first-in first-out (FIFO) stacks when

selected transitions are detected on capture input pins, CAPx for x = 1, 2, 3, or 4. The capture unit of the

TMS320x240 consists of four capture circuits.

TMS320F240 Datasheet(PDF) 42 Page - Texas Instruments

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