Path: utzoo!attcan!uunet!zephyr.ens.tek.com!uw-beaver!sumax!ole!ray
From: ray@ole.UUCP (Ray Berry)
Newsgroups: sci.electronics
Subject: Re: micro-controller
Message-ID: <1674@ole.UUCP>
Date: 30 Sep 90 23:30:49 GMT
References: <8638@ncar.ucar.edu>
Distribution: sci.electronics
Organization: Seattle Silicon Corp., Bellevue, WA.
Lines: 36

(stuff about 18-pin Zilog Z8 derivatives)..
hpoppe@ncar.ucar.edu (Herb Poppe) writes:

>If there is not an EEPROM or windowed EPROM version of these devices, what 
>device (or development system) is used to develop/test software.

	There are development boards available (one I used was $175) that
have a 40-pin romless part, a serial port, and breadboard area etc.  I did
one design by plugging a smart EPROM emulator into the EPROM socket on the
dev. board.  Worked out ok.  Needless to say for more complex projects more
clout might be necessary.  No code changes were required to adopt the code
to the 18 pin prod. device.   A minor change (port assignments) *was* required 
to use the E08 OTP.

>Are the timer(s) in the 18-pin devices capable of measuring the widths of 
>a PWM input while simultaneously generating an independent PWM output?

	In a word, no.  The E08 has two programmable counters- 8 bit counters
with a fully programmable 6 bit prescaler.  One of the two counters has gated/
triggered clock capability.  The other one is driven only from the cpu osc.
See the spec sheet for more specific details.

	In general, I'd say the parts have a lot of flexibility- user program-
mable pullups, schmitt inputs, interrupt i/ps of pos/neg edge polarity, user
definable interrupt prioritization, etc..  the E08 also has 2 analog compara-
tors.

disclaimer:	I have no personal stake/interest in Zilog- just speaking as
a satisfied user.

>Herb Poppe             hpoppe@ncar.ucar.edu
>NCAR                      (303) 497-1296
>1850 Table Mesa Dr.
>Boulder, CO  80307-3000
-- 
Ray Berry  kb7ht  uucp: ...ole!ray CIS: 73407,3152 /* "inquire within" */