发明授权
- 专利标题: Microcomputer with synchronized data transfer
- 专利标题(中): 微电脑同步数据传输
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申请号: US255255申请日: 1988-10-11
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公开(公告)号: US4975593A公开(公告)日: 1990-12-04
- 发明人: Keiichi Kurakazu , Haruo Keida , Kazuyoshi Kikuta
- 申请人: Keiichi Kurakazu , Haruo Keida , Kazuyoshi Kikuta
- 申请人地址: JPX Tokyo JPX Tokyo
- 专利权人: Hitachi, Ltd.,Hitachi Microcomputer Engineering, Ltd.
- 当前专利权人: Hitachi, Ltd.,Hitachi Microcomputer Engineering, Ltd.
- 当前专利权人地址: JPX Tokyo JPX Tokyo
- 优先权: JPX58-190776 19831014
- 主分类号: G06F13/38
- IPC分类号: G06F13/38 ; G06F1/04 ; G06F1/12 ; G06F13/42 ; G06F15/78
摘要:
A single-chip microcomputer has external terminals outputting a system clock signal, an address signal, and a data signals. External equipment such as an external memory is operated by address and signal which are output when the system clock signal changes. In the single-chip microcomputer of this invention, the operation of an address signal output circuit and that of a data signal output circuit are controlled by a signal output from a digital delay circuit which receives the system clock signal. According to this circuit construction, the hold time between the change in the system clock and the change in the address and data signals is determined by the delay circuit which exhibits a digital operation, so that the hold time can be set accurately without being affected adversely by any variation in the circuit elements due to the manufacturing process, or by temperature changes.
公开/授权文献
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