• 參數(shù)資料
    型號: SC16C554BIB80,557
    廠商: NXP Semiconductors
    文件頁數(shù): 48/57頁
    文件大小: 0K
    描述: IC UART QUAD SOT315-1
    標準包裝: 595
    通道數(shù): 4,QUART
    FIFO's: 16 字節(jié)
    電源電壓: 2.5V,3.3V,5V
    帶自動流量控制功能:
    帶故障啟動位檢測功能:
    帶調(diào)制解調(diào)器控制功能:
    帶CMOS:
    安裝類型: 表面貼裝
    封裝/外殼: 80-LQFP
    供應商設備封裝: 80-LQFP(12x12)
    包裝: 托盤
    其它名稱: 568-8272
    935274934557
    SC16C554BIB80
    SC16C554BIB80,557-ND
    SC16C554BIB80-ND
    2010-2012 Microchip Technology Inc.
    DS41413C-page 53
    PIC12(L)F1822/PIC16(L)F1823
    4.2
    Code Protection
    Code protection allows the device to be protected from
    unauthorized access. Program memory protection and
    data EEPROM protection are controlled independently.
    Internal access to the program memory and data
    EEPROM are unaffected by any code protection
    setting.
    4.2.1
    PROGRAM MEMORY PROTECTION
    The entire program memory space is protected from
    external reads and writes by the CP bit in Configuration
    Word 1. When CP = 0, external reads and writes of
    program memory are inhibited and a read will return all
    ‘0’s. The CPU can continue to read program memory,
    regardless of the protection bit settings. Writing the
    program memory is dependent upon the write
    protection
    setting.
    See
    for more information.
    4.2.2
    DATA EEPROM PROTECTION
    The entire data EEPROM is protected from external
    reads and writes by the CPD bit. When CPD = 0,
    external reads and writes of data EEPROM are
    inhibited. The CPU can continue to read and write data
    EEPROM regardless of the protection bit settings.
    4.3
    Write Protection
    Write protection allows the device to be protected from
    unintended
    self-writes.
    Applications,
    such
    as
    bootloader software, can be protected while allowing
    other regions of the program memory to be modified.
    The WRT<1:0> bits in Configuration Word 2 define the
    size of the program memory block that is protected.
    4.4
    User ID
    Four memory locations (8000h-8003h) are designated as
    ID locations where the user can store checksum or other
    code identification numbers. These locations are
    readable and writable during normal execution. See
    for more information on accessing these
    memory locations. For more information on checksum
    calculation, see the “PIC16F/LF1826/27/PIC12F/LF1822
    Memory Programming Specification
    ” (DS41390).
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