Computer apparatus having electrically rewritable

专利名称：Computer apparatus having electrically

rewritable nonvolatile memory, andnonvolatile semiconductor memory

发明人：Yutaka Iizuka,Kinya Morinouchi申请号：US08/879885申请日：19970620公开号：US05933595A公开日：19990803

摘要：When the contents of a flash ROM which is an electrically rewritable nonvolatilememory are rewritten, after an IPL program for rewriting stored in the flash ROM istransferred to a RAM, mapping of memory space is switched by a switching controlcircuit. The IPL program transferred to the RAM is protected. The contents of the flashROM are erased by use of the IPL program, and an updated program supplied throughan RS-232C interface is written into the flash ROM. When a bug is caused due to staticelectricity in the IPL program stored in the flash ROM, an EPROM which is a nonvolatilememory element is attached, an IPL program stored in the EPROM is executed, and theIPL program stored in the EPROM is directly transferred to the flash ROM.

申请人：SHARP KABUSHIKI KAISHA

更多信息请下载全文后查看