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  • 參數(shù)資料
    型號: 24C00-EOT
    廠商: Microchip Technology Inc.
    英文描述: 128 Bit I 2 C? Bus Serial EEPROM
    中文描述: 128位的I 2 C?總線串行EEPROM
    文件頁數(shù): 7/18頁
    文件大?。?/td> 264K
    代理商: 24C00-EOT
    2003 Microchip Technology Inc.
    DS21178D-page 7
    24AA00/24LC00/24C00
    7.0
    ACKNOWLEDGE POLLING
    Since the device will not acknowledge during a write
    cycle, this can be used to determine when the cycle is
    complete (this feature can be used to maximize bus
    throughput). Once the Stop condition for a Write
    command has been issued from the master, the device
    initiates the internally timed write cycle. ACK polling
    can be initiated immediately. This involves the master
    sending a Start condition followed by the control byte
    for a Write command (R/W =
    0
    ). If the device is still
    busy with the write cycle, then no ACK will be returned.
    If no ACK is returned, then the Start bit and control byte
    must be re-sent. If the cycle is complete, then the
    device will return the ACK and the master can then
    proceed with the next Read or Write command. See
    Figure 7-1 for flow diagram.
    FIGURE 7-1:
    ACKNOWLEDGE
    POLLING FLOW
    FIGURE 7-2:
    BYTE WRITE
    Send
    Write Command
    Send Stop
    Condition to
    Initiate Write Cycle
    Send Start
    Send Control Byte
    with R/W =
    0
    Did Device
    Acknowledge
    (ACK = 0)
    Next
    Operation
    NO
    YES
    S
    P
    BUS ACTIVITY
    MASTER
    SDA LINE
    BUS ACTIVITY
    S
    T
    A
    R
    T
    S
    T
    O
    P
    CONTROL
    BYTE
    WORD
    ADDRESS
    DATA
    A
    C
    K
    A
    C
    K
    A
    C
    K
    1
    0
    X
    1
    0
    X
    X
    X
    X = Don’t Care Bit
    X
    X
    X
    0
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