发明名称 |
Microcomputer and microprocessor having flash memory operable from single external power supply |
摘要 |
A microcomputer incorporating a flash memory which is erased and programmed electrically in a stable manner within a relatively wide range of external power supply voltages including those for low-voltage operations The microcomputer comprises a voltage clamp unit including a reference voltage generating circuit and a constant voltage generating circuit. In operation, the voltage clamp unit generates a voltage of a low dependency on a supply voltage and clamps the generated voltage to a voltage level which, within a tolerable range, is lower than a single supply voltage externally furnished This prevents voltages boosted by boosting circuits operating on the clamped voltage, i.e., programming and erasure voltages, from being dependent on the externally supplied voltage.
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申请公布号 |
US6154412(A) |
申请公布日期 |
2000.11.28 |
申请号 |
US19990397851 |
申请日期 |
1999.09.17 |
申请人 |
HITACHI, LTD. |
发明人 |
ISHIKAWA, EIICHI;SAITO, YASUYUKI;SATO, MASANAO;YADA, NAOKI;MATSUBARA, KIYOSHI |
分类号 |
G11C5/14;G11C16/30;(IPC1-7):G11C7/00 |
主分类号 |
G11C5/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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