发明名称 |
Microcomputer with built-in programmable nonvolatile memory |
摘要 |
A microcomputer comprises: a flash memory for storing rewriting control F/W and user S/F; a command register for specifying content of rewriting control; a address register to be subjected to rewriting-control; a data register for specifying data to be written; a power-supply pump circuit in the flash memory; and a control signal register for specifying/outputting a control signal to a memory decoder. A CPU of the microcomputer is capable of accessing these four registers to perform writing or reading. A given bit of the control signal register corresponds to a given control signal. A value written to the register becomes a control signal that will be directly supplied to both of the power supply circuit and the memory decoder, in the flash memory, to control them. By rewriting a set value of this control signal register using the rewriting control F/W according to a specified sequence, processing such as "erase" and "program" of the flash memory is performed. As a result, a layout area of an automatic sequence circuit is decreased, and a change in a sequence is also facilitated.
|
申请公布号 |
US6587916(B2) |
申请公布日期 |
2003.07.01 |
申请号 |
US20010948042 |
申请日期 |
2001.09.07 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA;MITSUBISHI ELECTRIC SEMICONDUCTOR SYSTEM CORPORATION;MITSUBISHI ELECTRIC ENGINEERING COMPANY LIMITED |
发明人 |
HONGO KATSUNOBU;TANAKA TSUTOMU;SEZAKI TOSHIHIRO;KIMURA HIROYUKI;KAMIYA MIKIO;AMI YASUHIRO;TANI KUNIO;IBA TOMOHISA |
分类号 |
G06F11/00;G06F15/78;(IPC1-7):G06F13/00 |
主分类号 |
G06F11/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|