A simpler approach may beto set the bit addresses of these bits in the. To reclaim these pins, remove allthe instructions that use ' pe' and ' pre'symbols. The two extra pins not required for the 93C46 aremanipulated by all the routines. Compability with other 3-Wire serial EEPROMsThe 93C46 chip should be usable, but care should be taken not tomake calls to the functions which access the protection register withinthe 93CS46. This codeshould work 'out of the box' with a 93CS46 chip. As mentioned above, four wires areactually required, and the 93CS46 has two additional lines that worktogether with a special write protection register. This 3-Wire interfacechip actually has 6 wires.
There are lots of other distributors too, but Mouser andDigiKey are probably the easiest, since they give out a free catalog What this 8051 family code doesThis code was written to support the 93CS46. Both have aminimum order, appox $25, and these serial EEPROMs are only about$1 each. DistributorsWithin the United States, the easiest way to get ahold of a 93C46 isto callDigiKey80 (MicroChip, maybe National) orMouser Electronics80 (SGS Thompson). Xicor once had a considerable collectionof example code on-line, but they appear to have removed it. Xicor offers 2-Wire interfaceand SPI interface serial EEPROMs, but apparantly nothing which willwork with the code below.
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