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- Newsgroups: sci.electronics
- Path: sparky!uunet!mcsun!news.funet.fi!luotsi.uku.fi!messi.uku.fi!jmarin
- From: jmarin@messi.uku.fi (Jukka Marin)
- Subject: Re: 68HC11E9
- Sender: news@luotsi.uku.fi
- Message-ID: <jmarin.721312910@messi.uku.fi>
- Date: 9 Nov 92 12:41:50 GMT
- References: <1dkug6INNffc@moe.ksu.ksu.edu>
- Organization: University of Kuopio, Finland
- Lines: 36
-
- hampster@phys.ksu.edu (Kip J. Mussatt) writes:
-
- >Question:
- > What is a good proven way to hook up this chip in single chip
- >mode to do A/D conversions and spit out data via the serial port?
-
- I use the 68HC11A1 chip to do this (and much more). I program the
- EEPROM with the code to do what I want, so I can use single chip
- mode. I wrote a small utility for my Amigas which programs the HC11
- RAM or EEPROM with one command.. Very fast to update the program
- code within the HC11.
-
- You'll also need a simple logic circuit to get the HC11 going after
- power-up (it needs a BREAK character from the RS232 to start up).
- I
- >have the data books, but little hints, and references would be neat to
- >have. If anyone has any suggestions or applications notes that I could
- >get copies of (I will pay for the copies) I would appreciate it. Also,
- >someone said this beast can run at 8MHz. I thought ALL HC11's topped out
- >at 4MHz ? Is this correct? Please E-Mail me any reponses/suggestions.
-
- The crystal frequency is 8MHz which is divided by 4 to get E clock of
- 2 MHz. There are chips which work with E clock = 4 MHz as well, but the
- common types can go at 2 MHz only (officially, you can overclock them if
- you dare.. ;-)
-
- >Thanks in advance.
-
- Hope this helps,
-
- Jukka Marin
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