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        參數(shù)資料
        型號: MC68332GCAG25
        廠商: FREESCALE SEMICONDUCTOR INC
        元件分類: 微控制器/微處理器
        英文描述: 32-BIT, 25 MHz, MICROCONTROLLER, PQFP144
        封裝: 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-144
        文件頁數(shù): 38/109頁
        文件大小: 787K
        代理商: MC68332GCAG25
        MOTOROLA
        MC68332
        34
        MC68332TS/D
        CSORBT, the option register for CSBOOT, contains special reset values that support bootstrap opera-
        tions from peripheral memory devices.
        The following bit descriptions apply to both CSORBT and CSOR[10:0] option registers.
        MODE — Asynchronous/Synchronous Mode
        0 = Asynchronous mode selected (chip-select assertion determined by internal or external bus con-
        trol signals)
        1 = Synchronous mode selected (chip-select assertion synchronized with ECLK signal)
        In asynchronous mode, the chip select is asserted synchronized with AS or DS.
        The DSACK field is not used in synchronous mode because a bus cycle is only performed as a syn-
        chronous operation. When a match condition occurs on a chip select programmed for synchronous op-
        eration, the chip select signals the EBI that an ECLK cycle is pending.
        BYTE — Upper/Lower Byte Option
        This field is used only when the chip-select 16-bit port option is selected in the pin assignment register.
        The following table lists upper/lower byte options.
        R/W — Read/Write
        This field causes a chip select to be asserted only for a read, only for a write, or for both read and write.
        Refer to the following table for options available.
        STRB — Address Strobe/Data Strobe
        0 = Address strobe
        1 = Data strobe
        This bit controls the timing for assertion of a chip select in asynchronous mode. Selecting address
        strobe causes chip select to be asserted synchronized with address strobe. Selecting data strobe caus-
        es chip select to be asserted synchronized with data strobe.
        CSORBT —Chip-Select Option Register Boot ROM
        $YFFA4A
        15
        14
        13
        12
        11
        10
        9
        6
        5
        4
        3
        1
        0
        MODE
        BYTE
        R/W
        STRB
        DSACK
        SPACE
        IPL
        AVEC
        RESET:
        0
        1
        0
        1
        0
        1
        0
        CSOR[10:0] —Chip-Select Option Registers
        $YFFA4E–$YFFA76
        15
        14
        13
        12
        11
        10
        9
        6
        5
        4
        3
        1
        0
        MODE
        BYTE
        R/W
        STRB
        DSACK
        SPACE
        IPL
        AVEC
        RESET:
        0
        Byte
        Description
        00
        Disable
        01
        Lower Byte
        10
        Upper Byte
        11
        Both Bytes
        R/W
        Description
        00
        Reserved
        01
        Read Only
        10
        Write Only
        11
        Read/Write
        F
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        Freescale Semiconductor, Inc.
        For More Information On This Product,
        Go to: www.freescale.com
        n
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