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    參數(shù)資料
    型號: SDA5251-2
    廠商: SIEMENS A G
    元件分類: 圖文
    英文描述: ICs for Consumer Electronics
    中文描述: TELETEXT DECODER, PDIP52
    文件頁數(shù): 33/143頁
    文件大小: 1050K
    代理商: SDA5251-2
    SDA 525x
    Semiconductor Group
    33
    1998-04-08
    6.2.10
    To fit the requirements of various applications the input circuit of the sandcastle decoder
    is programmable. Both slicing levels (
    V
    SCH
    ,
    V
    SCL2
    ) which are important for proper SC-
    decoder function can be varied in a range of about 0.9 V and in addition there is the
    possibility to increase the implemented hysteresis by 0.3 V typically. Further noise
    reduction and spike rejection on pin SC is accomplished by using a digital filter following
    the input circuitry. See
    Figure
    41
    on
    page 133
    for further information on
    V
    SCH
    and
    V
    SCL2
    .
    Sandcastle Decoder
    Sandcastle Control Register SCCON
    Sandcastle Control Register
    Default after reset: 00
    H
    (MSB)
    0
    SCCH.2
    SCCON
    SFR-Address CE
    H
    (LSB)
    SCCL.0
    SCCH.1
    SCCH.0
    0
    SCCL.2
    SCCL.1
    SCCL1...0
    00 = set
    V
    SCL2
    to lowest level (1.0 V typ.)
    01 = increase
    V
    SCL2
    by 0.3 V (typ.)
    10 = increase
    V
    SCL2
    by 0.6 V (typ.)
    11 = increase
    V
    SCL2
    by 0.9 V (typ.)
    SCL.2
    0 = hysteresis
    V
    SCL2
    set to 0.3 V (typ.)
    1 = increase hysteresis
    V
    SCL2
    by 0.6 V (typ.)
    SCCH1...0
    00 = set
    V
    SCH
    to lowest level 3.0 V (typ.)
    01 = increase
    V
    SCH
    by 0.3 V (typ.)
    10 = increase
    V
    SCH
    by 0.6 V (typ.)
    11 = increase
    V
    SCH
    by 0.9 V (typ.)
    SCCH.2
    0 = hysteresis
    V
    SCH
    set to 0.3 V (typ.)
    1 = increase hysteresis
    V
    SCH
    by 0.6 V
    Attention
    Bits 3 and 7 have to be set to ‘0’.
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