Microcomputer having built-in nonvolatile memory for simultaneous use as a program area and a data area
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United States of America Patent
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Jul 22, 2003
Grant Date -
N/A
app pub date -
Mar 31, 2000
filing date -
Apr 2, 1999
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A 1-chip microcomputer having a built-in nonvolatile memory includes at least one erasable flash memory provided in a memory space of the microcomputer, a boot ROM for storing an initial program to start up the 1-chip microcomputer and a transfer program to transfer the initial program to the flash memory, and control means for, when the flash memory stores no program, transferring the initial program to the flash memory in accordance with the transfer program and subsequently removing the boot ROM from the memory space. Consequently, even if a new program is additionally stored to the nonvolatile memory in the 1-chip microcomputer, the additional program can be carried out.
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