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    參數(shù)資料
    型號: MC68HC05J1AVDWR2
    廠商: MOTOROLA INC
    元件分類: 微控制器/微處理器
    英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
    封裝: SOIC-20
    文件頁數(shù): 84/126頁
    文件大?。?/td> 1118K
    代理商: MC68HC05J1AVDWR2
    Technical Data
    MC68HC05J1A — Rev. 1.0
    60
    Parallel Input/Output (I/O)
    MOTOROLA
    Parallel Input/Output (I/O)
    7.4 Port A
    Port A is an 8-bit, general-purpose, bidirectional I/O port with these
    features:
    Programmable pulldown devices (mask option)
    8-mA current sinking capability (pins PA7–PA4)
    External interrupt capability (mask option: pins PA3–PA0)
    7.4.1 Port A Data Register
    The port A data register (PORTA) contains a bit for each of the port A
    pins. When a port A pin is programmed to be an output, the state of its
    data register bit determines the state of the output pin. When a port A pin
    is programmed to be an input, reading the port A data register returns
    the logic state of the pin.
    PA7–PA0 — Port A Data Bits
    These read/write bits are software-programmable. Data direction of
    each bit is under the control of the corresponding bit in data direction
    register A. Resets have no effect on port A data.
    Address:
    $0000
    Bit 7
    654321
    Bit 0
    Read:
    PA7
    PA6
    PA5
    PA4
    PA3
    PA2
    PA1
    PA0
    Write:
    Reset:
    Unaffected by reset
    Figure 7-1. Port A Data Register (PORTA)
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