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View Full Version : NMIX-0012 at lower than standard 16MHz Xtal?


Harry Winter
08-22-01, 01:49 PM
For my very low power "StarTrek TriCorder" project I must run the NMIN-0012 with a 4MHz Xtal (1/4 the standard) . What happens to the timing for EEPROM and Flash programming?
For the HC11, the variable address in RAM for the timing of EEROM programming is listed in the 3.5 Max Forth documentation. Is there a listing for the HC12 Forth RAM variables?
Harry

I was hoping for an answer --- where does Max Forth 5.0 L find the variables for timing the EE and Flash programming?

HW

rob
08-24-01, 04:19 PM
For eeprom timing, a timing loop is used and the timing count is kept
in the variable EDELAY which is described at:

http://www.ee.ualberta.ca/~rchapman/MFwebsite/V50/Alphabetical/Detailed/index.html

or

http://www.ee.ualberta.ca/~rchapman/MFwebsite/V50/Alphabetical/Detailed/Group_E.html#anchor148

As for the timing of the flash memory writing, it is controlled using
timer counter 0. To get the timing write there, you'd have to adjust
some of the hardware registers

If you are talking over the serial port, you will have to adjust its
rate accordingly.

I've not played with the internal oscillator, but I wonder if you could
make the cpu run at the same speed as with the 16mhz xtal.

Rob