| ??? 01/16/07 15:39 Read: times |
#130899 - a parallel in '51 Responding to: ???'s previous message |
I give you a parallel in the '51 world.
A nice thing on '51's is, that they "obey an unwritten rule of invariability of SFRs". Most of the functionality of 8051 is present in _unmodified_ form in the new derivatives - yes they have extra features but they tend to be by default off, or they don't interfere with the old ones. And, the SFRs are on the same position. Now, some of the derivatives departed from this "rule". They might have good reasons for this (e.g. easier routing, smaller chip area). Also, they might claim, as long as you "play correctly" and are using symbolic names for the SFRs/SFR bits and make no implied assumptions on their location and whereabouts (e.g. that using a certain mask on a bit-addressable SFR would clear more SFR bits at once) - it's enough to change the headers and recompile. But that's not just as easy as this. And Erik calls such chips "deviates". JW |
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