发明授权
US5925139A Microcomputer capable of preventing writing errors in a non-volatile
memory
失效
能够防止在非易失性存储器中写入错误的微型计算机
- 专利标题： Microcomputer capable of preventing writing errors in a non-volatile memory
- 专利标题（中）： 能够防止在非易失性存储器中写入错误的微型计算机
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申请号： US821598申请日： 1997-03-20
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公开(公告)号： US5925139A公开(公告)日： 1999-07-20
- 发明人: Susumu Yamada , Toru Watanabe , Shinichi Yamasaki
- 申请人： Susumu Yamada , Toru Watanabe , Shinichi Yamasaki
- 申请人地址： JPX Osaka
- 专利权人： Sanyo Electric Co., Ltd.
- 当前专利权人： Sanyo Electric Co., Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX8-068390 19960325; JPX8-088400 19960410
- 主分类号： G11C16/22
- IPC分类号： G11C16/22 ; G06F1/30 ; G06F11/00
摘要：
When data are to be written in an EEPROM (1), a CPU (2) sets a flag (12). A voltage booster (13) boosts the power voltage in compliance with the setting of the flag (12). A voltage boost detector (14) detects whether the output of the voltage booster (13) is in voltage boost state. If the output of the voltage booster (13) is not in voltage boost state, a latch (15) is reset and the EEPROM (1) is not permitted to switch to write mode. As a result, it is possible to prevent incorrect data writing in the EEPROM (1) even when the flag (12) has been incorrectly set.
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