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  • 參數(shù)資料
    型號: PIC16LF74T-I/PTG
    廠商: Microchip Technology
    文件頁數(shù): 55/104頁
    文件大?。?/td> 0K
    描述: IC MCU FLASH 4KX14 44TQFP
    標準包裝: 1,200
    系列: PIC® 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,SPI,UART/USART
    外圍設備: 欠壓檢測/復位,POR,PWM,WDT
    輸入/輸出數(shù): 33
    程序存儲器容量: 7KB(4K x 14)
    程序存儲器類型: 閃存
    RAM 容量: 192 x 8
    電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
    數(shù)據(jù)轉換器: A/D 8x8b
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 44-TQFP
    包裝: 帶卷 (TR)
    Micrel, Inc.
    KSZ8851-16MLLJ
    March 2010
    46
    M9999-030210-1.0
    Host MAC Address Registers: MARL, MARM and MARH
    These Host MAC address registers are loaded starting at word location 0x1 of the EEPROM upon hardware reset. The
    software driver can read or write these registers value, but it will not modify the original Host MAC address value in the
    EEPROM. These six bytes of Host MAC address in external EEPROM are loaded to these three registers as mapping
    below:
    MARL[15:0] = EEPROM 0x1(MAC Byte 2 and 1)
    MARM[15:0] = EEPROM 0x2(MAC Byte 4 and 3)
    MARH[15:0] = EEPROM 0x3(MAC Byte 6 and 5)
    The Host MAC address is used to define the individual destination address that the KSZ8851-16MLLJ responds to when
    receiving frames. Network addresses are generally expressed in the form of 01:23:45:67:89:AB, where the bytes are
    received from left to right, and the bits within each byte are received from right to left (LSB to MSB). For example, the
    actual transmitted and received bits are on the order of 10000000 11000100 10100010 11100110 10010001 11010101.
    These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below:
    MARL[15:0] = 0x89AB
    MARM[15:0] = 0x4567
    MARH[15:0] = 0x0123
    Host MAC Address Register Low (0x10 – 0x11): MARL
    The following table shows the register bit fields for Low word of Host MAC address.
    Bit
    Default Value
    R/W
    Description
    15-0
    -
    RW
    MARL MAC Address Low
    The least significant word of the MAC address.
    Host MAC Address Register Middle (0x12 – 0x13): MARM
    The following table shows the register bit fields for middle word of Host MAC address.
    Bit
    Default Value
    R/W
    Description
    15-0
    -
    RW
    MARM MAC Address Middle
    The middle word of the MAC address.
    Host MAC Address Register High (0x14 – 0x15): MARH
    The following table shows the register bit fields for high word of Host MAC address.
    Bit
    Default Value
    R/W
    Description
    15-0
    -
    RW
    MARH MAC Address High
    The Most significant word of the MAC address.
    0x16 – 0x1F: Reserved
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