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  • 參數(shù)資料
    型號(hào)： MCP2510-E/SO
    廠商： Microchip Technology
    文件頁(yè)數(shù)： 22/80頁(yè)
    文件大?。?/td> 0K
    描述： IC CAN CTLR EXTENDED TEMP 18SOIC
    產(chǎn)品培訓(xùn)模塊： CAN Bus Protection
    標(biāo)準(zhǔn)包裝： 42
    控制器類型： CAN 接口
    接口： SPI
    電源電壓： 4.5 V ~ 5.5 V
    電流 - 電源： 10mA
    工作溫度： -40°C ~ 125°C
    安裝類型： 表面貼裝
    封裝/外殼： 18-SOIC（0.295"，7.50mm 寬）
    供應(yīng)商設(shè)備封裝： 18-SOIC
    包裝： 管件
    產(chǎn)品目錄頁(yè)面： 685 (CN2011-ZH PDF)
    配用： DV251001-ND - KIT DEVELOPMENT CAN MCP2510
    2007 Microchip Technology Inc.
    DS21291F-page 29
    MCP2510
    4.5
    Message Acceptance Filters and
    Masks
    The Message Acceptance Filters And Masks are used
    to determine if a message in the message assembly
    buffer should be loaded into either of the receive buff-
    ers (see Figure 4-3). Once a valid message has been
    received into the MAB, the identifier fields of the mes-
    sage are compared to the filter values. If there is a
    match, that message will be loaded into the appropriate
    receive buffer. The filter masks (see Register 4-10
    through Register 4-17) are used to determine which
    bits in the identifier are examined with the filters. A truth
    table is shown below in Table 4-1 that indicates how
    each bit in the identifier is compared to the masks and
    filters to determine if a the message should be loaded
    into a receive buffer. The mask essentially determines
    which bits to apply the acceptance filters to. If any mask
    bit is set to a zero, then that bit will automatically be
    accepted regardless of the filter bit.
    TABLE 4-1:
    FILTER/MASK TRUTH TABLE
    As shown in the Receive Buffers Block Diagram
    (Figure 4-1), acceptance filters RXF0 and RXF1, and
    filter mask RXM0 are associated with RXB0. Filters
    RXF2, RXF3, RXF4, and RXF5 and mask RXM1 are
    associated with RXB1. When a filter matches and a
    message is loaded into the receive buffer, the filter
    number that enabled the message reception is loaded
    into the RXBNCTRL register FILHIT bit(s). For RXB1
    the RXB1CTRL register contains the FILHIT<2:0> bits.
    They are coded as follows:
    - 101 = Acceptance Filter 5 (RXF5)
    - 100 = Acceptance Filter 4 (RXF4)
    - 011 = Acceptance Filter 3 (RXF3)
    - 010 = Acceptance Filter 2 (RXF2)
    - 001 = Acceptance Filter 1 (RXF1)
    - 000 = Acceptance Filter 0 (RXF0)
    RXB0CTRL contains two copies of the BUKT bit and
    the FILHIT<0> bit.
    The coding of the BUKT bit enables these three bits to
    be used similarly to the RXB1CTRL.FILHIT bits and to
    distinguish a hit on filter RXF0 and RXF1 in either
    RXB0 or after a roll over into RXB1.
    - 111 = Acceptance Filter 1 (RXF1)
    - 110 = Acceptance Filter 0 (RXF0)
    - 001 = Acceptance Filter 1 (RXF1)
    - 000 = Acceptance Filter 0
    If the BUKT bit is clear, there are six codes correspond-
    ing to the six filters. If the BUKT bit is set, there are six
    codes corresponding to the six filters plus two addi-
    tional codes corresponding to RXF0 and RXF1 filters
    that roll over into RXB1.
    If more than one acceptance filter matches, the FILHIT
    bits will encode the binary value of the lowest num-
    bered filter that matched. In other words, if filter RXF2
    and filter RXF4 match, FILHIT will be loaded with the
    value for RXF2. This essentially prioritizes the accep-
    tance filters with a lower number filter having higher pri-
    ority. Messages are compared to filters in ascending
    order of filter number.
    The mask and filter registers can only be modified
    when the MCP2510 is in configuration mode (see
    Mask Bit
    n
    Filter Bit
    n
    Message
    Identifier bit
    n001
    Accept or
    reject bit n
    0X
    X
    Accept
    10
    0
    Accept
    1
    0
    1
    Reject
    1
    0
    Reject
    11
    1
    Accept
    Note:
    X = don’t care
    Note:
    000
    and 001 can only occur if the BUKT bit
    (see Table 4-1) is set in the RXB0CTRL
    register allowing RXB0 messages to roll
    over into RXB1.
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