• <dl id="ona6b"></dl>
  • 參數(shù)資料
    型號(hào): HMS99C52S
    廠商: Electronic Theatre Controls, Inc.
    英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH
    中文描述: 8位單片機(jī)與嵌入式閃存微控制器
    文件頁數(shù): 16/73頁
    文件大小: 696K
    代理商: HMS99C52S
    HMS99C51S/52S/54S/56S/58S
    12
    Sep. 2004 Ver 1.01
    CPU
    The HMS99C51S/52S/54S/56S/58S are efficient both as a controller and as an arithmetic processor. It has ex-
    tensive facilities for binary and BCD arithmetic and excels in its bit-handling capabilities. Efficient use of pro-
    gram memory results from an instruction set consisting of 44% one-byte, 41% two-byte, and 15% three-byte
    instructions. With a 12 MHz crystal, 58% of the instructions are executed in 1.0
    μ
    s (40MHz: 300ns).
    Special Function Register PSW
    Reset value of PSW is 00
    H
    .
    Bit
    Function
    CY
    Carry Flag
    AC
    Auxiliary Carry Flag
    (for BCD operations)
    F0
    General Purpose Flag
    RS1
    0
    0
    1
    1
    RS0
    0
    1
    0
    1
    Register Bank select control bits
    Bank 0 selected, data address 00
    H
    - 07
    H
    Bank 1 selected, data address 08
    H
    - 0F
    H
    Bank 2 selected, data address 10
    H
    - 17
    H
    Bank 3 selected, data address 18
    H
    - 1F
    H
    OV
    Overflow Flag
    F1
    General Purpose Flag
    P
    Parity Flag
    Set/cleared by hardware each instruction cycle to indicate an odd/even
    number of "one" bits in the accumulator, i.e. even parity.
    CY
    AC
    F0
    RS1 RS0 OV
    F1
    P
    7
    6
    5
    4
    3
    2
    1
    0
    LSB
    MSB
    Bit No.
    Addr. D0
    H
    PSW
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