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  • 參數(shù)資料
    型號(hào): BU-61865F4-142Q
    廠商: DATA DEVICE CORP
    元件分類: 微控制器/微處理器
    英文描述: 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
    封裝: 1 X 1 INCH, 0.155 INCH HEIGHT, FP-72
    文件頁(yè)數(shù): 9/56頁(yè)
    文件大?。?/td> 321K
    代理商: BU-61865F4-142Q
    The op code parity bit encompasses all sixteen bits of the op
    code word. This bit must be programmed for odd parity. If the
    message sequence control processor fetches an undefined op
    code word, an op code word with even parity, or bits 9-5 of an op
    code word do not have a binary pattern of 01010, the message
    sequence control processor will immediately halt the BC's oper-
    ation. In addition, if enabled, a BC TRAP OP CODE interrupt will
    be issued. Also, if enabled, a parity error will result in an OP
    CODE PARITY ERROR interrupt.
    TABLE 37 describes the Condition Codes.
    17
    TABLE 36. BC OPERATIONS FOR MESSAGE SEQUENCE CONTROL
    INSTRUCTION MNEMONIC
    OP CODE
    (HEX)
    PARAMETER
    CONDITIONAL
    OR
    UNCONDITIONAL
    DESCRIPTION
    Interrupt
    Request
    Execute
    Message
    IRQ
    XEQ
    0006
    0001
    Interrupt
    Bit Pattern
    in 4 LS bits
    Message Control /
    Status Block
    Address
    Conditional
    Generate an interrupt if the condition flag tests TRUE, otherwise
    continue execution at the next OpCode in the instruction list.
    The passed parameter (Interrupt Bit Pattern) specifies which of
    the ENHANCED BC IRQ bit(s) (bits 5-2) will be set in Interrupt
    Status Register #2. Only the four LSBs of the passed parameter
    are used. A parameter where the four LSBs are logic "0" will
    not generate an interrupt.
    Executes the message at the specified Message Control/Status
    Block Address if the condition flag tests TRUE, otherwise contin-
    ue execution at the next OpCode in the instruction list.
    Compare to
    Frame Timer
    Halt
    Jump
    CFT
    HLT
    JMP
    000A
    0007
    0002
    Delay Time Value
    (Resolution
    = 100S / LSB)
    Not Used
    (Don’t Care)
    Instruction List
    Addrss
    Unconditional
    Conditional
    Compare Time Value to Frame Time Counter and set or clear
    the LT and EQ flag based on the results of the compare.
    Stop execution of the Message Sequence Control Program until
    a new BC Start is issued by the host if the condition flag tests
    TRUE, otherwise continue execution at the next OpCode in the
    instruction list.
    Jump to the OpCode specified in the Instruction List if the condi-
    tion flag tests TRUE, otherwise continue execution at the next
    OpCode in the instruction list.
    Compare to
    Message
    Timer
    Delay
    Subroutine
    Call
    CMT
    DLY
    CAL
    000B
    0008
    0003
    Delay Time Value
    (Resolution
    = 1S / LSB)
    Delay Time Value
    (Resolution = 1S)
    Instruction List
    Addrss
    Unconditional
    Conditional
    Compare Time Value to Message Time Counter and set or clear
    the LT and EQ flag based on the results of the compare.
    Delay the time specified by the Time parameter before executing
    the next OpCode if the condition flag tests TRUE, otherwise
    continue execution at the next OpCode without delay. The delay
    generated will use the Time to Next Message Timer.
    Jump to the OpCode specified by the Instruction List Address
    and push the Address of the Next OpCode on the Call Stack if
    the condition flag test TRUE, otherwise continue execution at
    the next OpCode in the instruction list. Note that the maximum
    depth of the subroutine call stack is four.
    GP Flag Bits
    Wait Until
    Frame Timer
    = 0
    Subroutine
    Retrn
    FLG
    WFT
    RTN
    000C
    0009
    0004
    Used to set,
    clear, or toggle GP
    (General Purpose)
    Flag bits
    (See description)
    Not Used
    (Don’t Care)
    Not Used
    (Don’t Care)
    Unconditional
    Conditional
    Used to set, toggle, or clear any or all of the eight general pur-
    pose flags. The table below illustrates the use of the GP Flag
    Bits instruction for the case of GP0 (General Purpose Flag 0).
    Bits 1 and 9 of the parameter byte affect flag GP1, bits 2 and 10
    effect GP2, etc., according to the following rules:
    Wait until Frame Time counter is equal to Zero before continuing
    execution of the Message Sequence Control Program if the
    condition flag tests TRUE, otherwise continue execution at the
    next OpCode without delay.
    Return to the OpCode popped off the Call Stack if the condition
    flag tests TRUE, otherwise continue execution at the next
    OpCode in the instruction list.
    Bit 8
    0
    1
    0
    1
    0
    1
    Bit 0
    Effect on GP0
    No Change
    Set Flag
    Clear Flag
    Toggle Flag
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