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    參數(shù)資料
    型號: M30240S9-XXXFP
    廠商: Mitsubishi Electric Corporation
    英文描述: 16 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor
    中文描述: 單片16位CMOS微機
    文件頁數(shù): 41/142頁
    文件大?。?/td> 1637K
    代理商: M30240S9-XXXFP
    1-41
    Mitsubishi microcomputers
    M30240 Group
    SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
    Preliminary Specifications REV. E
    Specifications in this manual are tentative and subject to change
    Frequency Synthesizer Circuit
    2.17 Frequency Synthesizer Circuit
    The Frequency Synthesizer Circuit generates a 48MHz clock needed by the USB block and a clock f
    SYN
    that are both a multiple of the external input reference clock f(Xin). A block diagram of the circuit is shown
    in Figure 1.23.
    Figure 1.23: Frequency Synthesizer Circuit
    The frequency synthesizer consists of a prescaler, frequency multiplier macro, a frequency divider
    macro, and five registers, namely FSP, FSM, FSC, FSD, and FSCCR. Clock f(Xin) is prescaled down
    using FSP to generate f
    PIN
    . f
    PIN
    is multiplied using FSM to generate an f
    VCO
    clock which is then divided
    using FSD to produce the clock f
    SYN
    . The f
    VCO
    clock is optimized for 48 MHz operation and is buffered
    and sent out of the frequency synthesizer block as signal f
    USB
    . This signal is used by the USB block.
    2.17.1 Prescaler
    Clock f
    PIN
    is a divided down version of clock f(Xin) (see Figure 1.24). The relationship between f
    PIN
    and the clock input to the prescaler f(Xin) is as follows:
    f
    PIN
    = f(Xin) / 2(n+1) where n is a decimal number between 0 and 254.
    Setting FSP to 255 disables the prescaler and f
    PIN
    = f(Xin).
    Note: f(Xin) frequency below 1 MHz is not recommended.
    Figure 1.24: Frequency Synthesizer Prescaler Register (FSP)
    FSP
    Data Bus
    FSM
    FSC
    FSD
    03DE
    03DD
    03DC
    03DF
    Frequency
    Multiplier
    Frequency
    Divider
    8
    LS
    8 Bit
    f(Xin)
    f
    VCO
    f
    SYN
    f
    USB
    Prescaler
    8
    f
    PIN
    FSCCR
    03DB
    FSCCR0
    EN
    USBC5
    2
    f
    PIN
    FSP
    f(Xin)
    Dec(n)
    255
    5
    2
    1
    0
    Hex(n)
    FF
    05
    02
    01
    00
    12 MHz
    1 MHz
    2 MHz
    3 MHz
    6 MHz
    12.00 MHz
    12.00 MHz
    12.00 MHz
    12.00 MHz
    12.00 MHz
    MSB
    7
    LSB
    0
    Bit 6
    Bit 1
    Bit 0
    Bit 2
    Bit 5
    Bit 4
    Bit 3
    Bit 7
    Access: R/W
    Address: 03DE
    16
    Reset: FF
    16
    f(Xin)
    /2(
    n
    +1) = f
    PIN
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