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    參數(shù)資料
    型號(hào): TMS320C40TABL40
    元件分類: 數(shù)字信號(hào)處理
    英文描述: 32-Bit Digital Signal Processor
    中文描述: 32位數(shù)字信號(hào)處理器
    文件頁(yè)數(shù): 49/132頁(yè)
    文件大小: 1707K
    代理商: TMS320C40TABL40
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    SPRS145G
    JULY 2000
    REVISED FEBRUARY 2002
    49
    POST OFFICE BOX 1443
    HOUSTON, TEXAS 77251
    1443
    general-purpose (GP) timers
    There are two GP timers. The GP timer x (x = 1 or 2 for EVA; x = 3 or 4 for EVB) includes:
    A 16-bit timer, up-/down-counter, TxCNT, for reads or writes
    A 16-bit timer-compare register, TxCMPR (double-buffered with shadow register), for reads or writes
    A 16-bit timer-period register, TxPR (double-buffered with shadow register), for reads or writes
    A 16-bit timer-control register,TxCON, for reads or writes
    Selectable internal or external input clocks
    A programmable prescaler for internal or external clock inputs
    Control and interrupt logic, for four maskable interrupts:
    underflow
    ,
    overflow
    ,
    timer compare
    , and
    period
    interrupts
    A selectable direction input pin (TDIRx) (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 are 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 each event manager. 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 16
    μ
    s) 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 eight PWM waveforms (outputs) can be generated simultaneously by each event manager: three
    independent pairs (six outputs) by the three full-compare units with
    programmable deadbands
    , and two
    independent PWMs by the GP-timer compares.
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