14 Jan
2014
14 Jan
'14
5:54 p.m.
On Jan 13, 2014 8:47 PM, "David Riley" <fraveydank at gmail.com> wrote:
The SEC is essentially the EC with a core that can be
run
static (i.e. you can stop the clock with no ill effect).
It's a drop-in replacement with improved power consumption,
so there's not a lot of reason to keep the other ones in
production at this point.
The MC68SEC000 is a drop-in replacement for the MC68EC000, but not
necessarily for the non-EC parts, because the EC and SEC use two-signal bus
arbitration (BR/BG) like the 48-pin MC68008, rather than three-signal
(BR/BG/BGACK) like the MC68000, MC68HC000, and MC68HC001.
And that it's not available in all of the packages the MC68000 was.