• 參數(shù)資料
    型號: COP8SGF540M3
    廠商: National Semiconductor Corporation
    英文描述: 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART
    中文描述: 8位的CMOS基于ROM和OTP微控制器具有8K到32K的內(nèi)存,2個比較器和USART
    文件頁數(shù): 15/62頁
    文件大?。?/td> 913K
    代理商: COP8SGF540M3
    4.0 Pin Descriptions
    (Continued)
    Note:
    For compatibility with existing software written for COP888xG devices
    and with existing Mask ROM devices, a read of the Port I input pins
    (address xxD7) will return the same data as reading the Port F input
    pins (address xx96). It is recommended new applications which will go
    to production with the COP8SGx use the Port F addresses. Note that
    compatible ROM devices contains the input only Port I instead of the
    bi-directional Port F.
    Port D is an 8-bit output port that is preset high when RESET
    goes low. The user can tie two or more D port outputs
    (except D2) together in order to get a higher drive.
    Note:
    Care must be exercised with the D2 pin operation. At RESET, the
    external loads on this pin must ensure that the output voltages stay
    above 0.7 V
    to prevent the chip from entering special modes. Also
    keep the external loading on D2 to less than 1000 pF.
    10131710
    FIGURE 4. I/O Port Configurations
    10131712
    FIGURE 5. I/O Port Configurations—Output Mode
    10131711
    FIGURE 6. I/O Port Configurations—Input Mode
    C
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