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  • 參數(shù)資料
    型號: M68HC711D3CP1
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 1 MHz, MICROCONTROLLER, PDIP40
    封裝: DIP-40
    文件頁數(shù): 31/124頁
    文件大小: 5398K
    代理商: M68HC711D3CP1
    PIN DESCRIPTIONS
    2-2
    TECHNICAL DATA
    Figure 2-2 Pin Assignments for 40-Pin DIP
    2.1 VDD, VSS, and EVSS
    Power is supplied to the MCU through VDD and VSS. VSS is the power supply, and
    VSS is ground. EVSS, available on the 44-pin PLCC, is an additional ground pin that
    must be grounded with VSS. The MCU operates from a single 5-volt (nominal) power
    supply. Very fast signal transitions occur on the MCU pins. The short rise and fall times
    place high, short duration current demands on the power supply. To prevent noise
    problems, provide good power supply bypassing at the MCU. Also, use bypass capac-
    itors that have good high-frequency characteristics and situate them as close to the
    MCU as possible. Bypass requirements vary, depending on how heavily the MCU pins
    are loaded.
    2.2 Reset (RESET)
    An active low bidirectional control signal, RESET, acts as an input to initialize the MCU
    to a known startup state. It also acts as an open-drain output to indicate that an internal
    failure has been detected in either the clock monitor or COP watchdog circuit. The
    CPU distinguishes between internal and external reset conditions by sensing whether
    the reset pin rises to a logic one in less than two E-clock cycles after a reset has oc-
    curred. It is not advisable to connect an external resistor-capacitor (RC) power-up de-
    lay circuit to the reset pin of M68HC11 devices because the circuit charge time
    PC7/ADDR7
    XIRQ/VPP
    PD7/R/W
    PD6/AS
    RESET
    IRQ
    PD0/RxD
    PD1/TxD
    PD2/MISO
    PD3/MOSI
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    PD4/SCK
    19
    PD5/SS
    20
    PC6/ADDR6
    8
    PC5/ADDR5
    7
    PC4/ADDR4
    6
    PC3/ADDR3
    5
    PC2/ADDR2
    4
    PC1/ADDR1
    3
    PC0/ADDR0
    2
    VSS
    1
    PB5/ADDR13
    PB6/ADDR14
    PB7/ADDR15
    PA0/IC3
    PA1/IC2
    PA2/IC1
    PA3/IC4/OC5/OC1
    PA5/OC3/OC1
    PA7/PAI/OC1
    VDD
    30
    29
    28
    27
    26
    25
    24
    23
    22
    21
    PB4/ADDR12
    31
    PB3/ADDR11
    32
    PB2/ADDR10
    33
    PB1/ADDR9
    34
    PB0/ADDR8
    35
    MODB/VSTBY
    36
    MODA/LIR
    37
    E
    38
    EXTAL
    39
    XTAL
    40
    MC68HC(7)11D3
    D3 40-PIN DIP
    F
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    Freescale Semiconductor, Inc.
    For More Information On This Product,
    Go to: www.freescale.com
    n
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