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1. 发明授权

US5652870A Microcomputer having multiplexable input-output port 失效
标题翻译：微电脑具有可复用的输入输出端口
公开(公告)号：US5652870A
公开(公告)日：1997-07-29
申请号：US420168
申请日：1995-04-11
申请人： Takashi Yamasaki , Hiroshi Sasahara , Tadahiko Komatsu
发明人： Takashi Yamasaki , Hiroshi Sasahara , Tadahiko Komatsu
IPC分类号： G06F13/42 , G06F13/16
CPC分类号： G06F13/4226
摘要： A microcomputer or a one-chip computer has address pins and data pins provided separately, and when a specified control signal is provided, the address pins act as multiplex pins for address and data signals. Further, a combination of bits for address signals and bits for data signals to be provided to the multiplex pins are changed according to a width of an external bus. For example, the data bits D.sub.i are combined with the address bits A.sub.i, as used previously. Further, the data bits D.sub.i-1 are combined with the address bits A.sub.i by shifting by one bit with respect to the address bits. One of the two types of the combination can be selected. If the microcomputer has 16-bit address pins, it can be connected to 8-bit memories having independent address and data pins, while it can also be connected to 8-bit peripherals having multiplex pins without using an external circuit for separating address and data signals.
摘要翻译：微型计算机或单片机具有单独提供的地址引脚和数据引脚，并且当提供指定的控制信号时，地址引脚用作地址和数据信号的多路复用引脚。此外，根据外部总线的宽度来改变要提供给多路复用引脚的用于地址信号的比特和用于数据信号的比特的组合。例如，数据位Di与以前使用的地址位Ai组合。此外，通过相对于地址位移位一位，数据位Di-1与地址位Ai组合。可以选择两种类型的组合之一。如果微型计算机具有16位地址引脚，则可以连接到具有独立地址和数据引脚的8位存储器，同时也可以连接到具有多路复用引脚的8位外设，而无需使用外部电路来分离地址和数据信号。

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