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  • 參數(shù)資料
    型號: μPD789177Y
    廠商: NEC Corp.
    英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
    中文描述: 8位單片機微控制器(8位單片微控制器)
    文件頁數(shù): 61/145頁
    文件大?。?/td> 610K
    代理商: ΜPD789177Y
    Preliminary Product Information
    60
    μ
    PD789166Y, 789167Y, 789176Y, 789177Y
    5.7.3
    A/D converter control registers
    The following two types of registers are used to control the A/D converter.
    A/D converter mode register 0 (ADM0)
    A/D input selection register 0 (ADS0)
    (1) A/D converter mode register 0 (ADM0)
    ADM0 specifies the conversion time for analog inputs. It also specifies whether to enable conversion.
    ADM0 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
    A RESET input clears ADM0 to 00H.
    Figure 5-29. Format of A/D Converter Mode Register 0
    A/D conversion control
    ADCS0
    0
    FR02
    FR01
    FR00
    0
    0
    0
    ADM0
    Symbol
    Address
    When reset
    R/W
    FF80H
    00H
    R/W
    7
    6
    5
    4
    3
    2
    1
    0
    ADCS0
    0
    1
    A/D conversion time selection
    Note 1
    FR02
    0
    0
    0
    1
    1
    1
    144/fx
    120/fx
    96/fx
    72/fx
    60/fx
    48/fx
    FR01
    0
    0
    1
    0
    0
    1
    (28.8 s)
    (24 s)
    (19.2 s)
    (14.4 s)
    (Not to be set
    Note 2
    )
    (Not to be set
    Note 2
    )
    FR00
    0
    1
    0
    0
    1
    0
    Other settings
    Conversion disabled
    Conversion enabled
    Not to be set
    Notes 1.
    The specifications of FR02, FR01, and FR00 must be such that the A/D conversion time is at least
    14
    μ
    s.
    2.
    These bit combinations must not be used, as the A/D conversion time will fall below 14
    μ
    s.
    Cautions 1.
    The result of conversion performed immediately after bit 7 (ADCS0) is set is undefined.
    Bits 0 to 2 and bit 6 must be fixed to 0.
    2.
    Remarks 1.
    f
    X
    : Main system clock oscillation frequency
    2.
    The parenthesized values apply to operation at f
    X
    = 5.0 MHz.
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