• 參數(shù)資料
    型號: ADUC848BS8-3
    廠商: ANALOG DEVICES INC
    元件分類: 微控制器/微處理器
    英文描述: MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU
    中文描述: 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, PQFP52
    封裝: 14 X 14 MM, PLASTIC, MO-112-AC-1, MQFP-52
    文件頁數(shù): 59/108頁
    文件大?。?/td> 1109K
    代理商: ADUC848BS8-3
    ADuC845/ADuC847/ADuC848
    Mode 5 (Dual 8-Bit PWM)
    In Mode 5, the duty cycle and the resolution of the PWM outputs
    are individually programmable. The maximum resolution of the
    PWM output is 8 bits.
    Rev. A | Page 59 of 108
    P2.6
    P2.5
    PWM COUNTERS
    PWM1H
    0
    PWM1L
    PWM0H
    PWM0L
    0
    Figure 43. PWM Mode 5
    Mode 6 (Dual RZ 16-Bit Σ-
    DAC)
    Mode 6 provides a high speed PWM output similar to that of a
    Σ-Δ DAC. Mode 6 operates very similarly to Mode 4; however,
    the key difference is that Mode 6 provides return to zero (RZ)
    Σ-Δ DAC output. Mode 4 provides non-return-to-zero Σ-Δ
    DAC outputs. RZ mode ensures that any difference in the rise
    and fall times does not affect the Σ-Δ DAC INL. However, RZ
    mode halves the dynamic range of the Σ-Δ DAC outputs from 0
    V to AV
    DD
    down to 0 V to AV
    DD
    /2. For best results, this mode
    should be used with a PWM clock divider of 4.
    If PWM1H is set to 4010H (slightly above one-quarter of FS),
    typically P2.6 is low for three full clocks (3 × 80 ns), high for
    one-half a clock (40 ns), and then low again for one-half a clock
    (40 ns) before repeating itself. Over every 65536 clocks, the
    PWM compromises for the fact that the output should be
    slightly above one-quarter of full scale by leaving the output
    high for two half clocks in four every so often.
    For faster DAC outputs (at lower resolution), write 0s to the
    LSBs that are not required with a 1 in the LSB position. If, for
    example, only 12-bit performance is required, write 0001 to the
    4 LSBs. This means that a 12-bit accurate Σ-Δ DAC output can
    occur at 3 kHz. Similarly, writing 00000001 to the 8 LSBs gives
    an 8-bit accurate Σ-Δ DAC output at 49 kHz.
    The output resolution is set by the PWM1L and PWM1H SFRs
    for the P2.5 and P2.6 outputs, respectively. PWM0L and PWM0H
    set the duty cycles of the PWM outputs at P2.5 and P2.6,
    respectively. Both PWMs have the same clock source and clock
    divider.
    3.146MHz
    16-BIT
    318
    μ
    s
    0
    16-BIT
    16-BIT
    16-BIT
    16-BIT
    16-BIT
    CARRY OUT AT P2.5
    CARRY OUT AT P2.6
    PWM0H/L = C000H
    PWM1H/L = 4000H
    0
    1
    0
    0
    0
    0
    LATCH
    0
    1
    1
    1
    1
    1
    0
    318
    μ
    s
    0, 3/4, 1/2, 1/4, 0
    0
    Figure 44. PWM Mode 6
    Mode 7
    In Mode 7, the PWM is disabled, allowing P2.5 and P2.6 to be
    used as normal.
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