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    • 6. 发明申请
    • Microcontroller
    • 微控制器
    • US20050235069A1
    • 2005-10-20
    • US10949300
    • 2004-09-27
    • Hirokazu MiwaYasuyuki HoriHiroyoshi Yamashita
    • Hirokazu MiwaYasuyuki HoriHiroyoshi Yamashita
    • G06F15/78G06F13/14G06F13/40
    • G06F13/4072
    • An external port control register of an input/output port outputs a setting value signal indicating a setting value in order that either a general-purpose input/output port function or a functional block input/output pin function is set to an external pin. A selector of the input/output port connects either a general output path or an output path of a functional block receiving a functional block input signal, to the external pin according to the setting value signal. An interrupting circuit interrupts the supply of the functional block input signal to the functional block when the setting value signal indicates the general-purpose input/output port function. Consequently, any register circuit designating whether to enable or disable the supply of the functional block input signal to the functional block need not be provided in particular, which can eliminate the need for a redundant setting process in switching the pin function of the external pin.
    • 输入/输出端口的外部端口控制寄存器输出指示设定值的设定值信号,以便将通用输入/输出端口功能或功能块输入/输出引脚功能设置为外部引脚。 输入/输出端口的选择器根据设置值信号将接收功能块输入信号的功能块的通用输出路径或输出路径连接到外部引脚。 当设定值信号表示通用输入/输出端口功能时,中断电路中断向功能块提供功能块输入信号。 因此,不需要特别提供指定是否启用功能块输入信号供给功能块的任何寄存器电路,这样可以消除在切换外部引脚的引脚功能时的冗余设置处理的需要。