🚀 go-pugleaf

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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