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    參數(shù)資料
    型號: COP8CBR9LVA8
    廠商: National Semiconductor
    文件頁數(shù): 80/111頁
    文件大?。?/td> 0K
    描述: IC MCU EEPROM 8BIT 32K 68PLCC
    標準包裝: 18
    系列: COP8™ 8C
    核心處理器: COP8
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: Microwire/Plus(SPI),UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 59
    程序存儲器容量: 32KB(32K x 8)
    程序存儲器類型: 閃存
    RAM 容量: 1K x 8
    電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 68-LCC(J 形引線)
    包裝: 管件
    其它名稱: *COP8CBR9LVA8
    SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
    Table 5-20. A/D Converter Channel Selection when the Multiplexor Output is Enabled
    Mode Select
    ADMOD = 0
    Mux Output
    Select Bits
    ADMOD = 1
    Single Ended
    Enabled
    Differential Mode
    Mode
    ADCH3
    ADCH2
    ADCH1
    ADCH0
    Channel No.
    Channel Pairs (+,
    MUX
    )
    0
    0, 1
    1
    0
    1
    1, 0
    1
    0
    1
    0
    2
    2, 3
    1
    0
    1
    3
    3, 2
    1
    0
    1
    0
    4
    4, 5
    1
    0
    1
    0
    1
    5
    5, 4
    1
    0
    1
    0
    6
    6, 7
    1
    0
    1
    7
    7, 6
    1
    0
    8
    8, 9
    1
    0
    1
    9
    9, 8
    1
    0
    1
    0
    10
    10, 11
    1
    0
    1
    11
    11, 10
    1
    0
    12
    Not Used(1)
    1
    0
    1
    13
    ADC13 is
    1
    Mux Output
    See(1)
    1
    0
    ADCH14 is
    1
    Mux Output(2)
    Mux Output +
    See (2)
    1
    ADCH15 is
    1
    A/D Input(2)
    (1)
    This Input Channel Selection should not be used in Differential Mode when the Multiplexor Output is enabled.
    (2)
    This Input Channel Selection should not be used when the Multiplexor Output is enabled.
    5.14.1.1.2 Multiplexor Output Select
    This 1-bit field allows the output of the A/D multiplexor and the input to the A/D to be connected directly to
    external pins. This allows for an external, common filter/signal conditioning circuit to be applied to all
    channels. The output of the external conditioning circuit can then be connected directly to the input of the
    Sample and Hold input on the A/D Converter. See Figure 5-20 for the single ended mode diagram. The
    Multiplexor output is connected to ADCH14 and the A/D input is connected to ADCH15. For Differential
    mode, the differential multiplexor outputs are available and should be converted to a single ended voltage
    for connection to the A/D Converter Input. See Figure 5-21.
    The channel assignments for this mode are shown in Table 5-21.
    When using the Mux Output feature, the delay though the internal multiplexor to the pin, plus the delay of
    the external filter circuit, plus the internal delay to the Sample and Hold will exceed the three clock cycles
    that's allowed in the conversion. This adds the requirement that, whenever the MUX bit = 1, that the
    channel selected by ADCH3:0 bits be enabled, even when ADBSY = 0, and gated to the mux output pin.
    The input path to the A/D converter is also enabled. This allows the input channel to be selected and
    settled before starting a conversion. The sequence to perform conversions using the Mux Out feature is a
    multistep process and is listed below.
    1. Select the desired channel and operating modes and load them into ENAD without setting ADBSY.
    2. Wait the appropriate time until the analog input has settled. This will depend on the application and the
    response of the external circuit.
    3. Select the same desired channel and operating modes used in step 1 and load them into ENAD and
    also set ADBSY or set ADBSY by using the SBIT instruction. This will start the conversion.
    70
    Functional Description
    Copyright 2000–2013, Texas Instruments Incorporated
    Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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