Re: MC6803U4 info?

[Ludis Langens <ludis@cruzers.com>]

"Daniel R. Henriksson" wrote:
> 
> Does anyone know the difference between the 6803C and the 6803U4?
> After digging on the net i have found out that the 6803U4 has an
> additional 64 bytes of onboard RAM at 0x40-0x7f.
> But i suspect there is some other differences, what about timer
> capabilities, there is a new SFR at 0x18 that's supposedly a
> timer control register, anyone know the specs. for that register?

I've got various data books with data on these chips.  Yes, the U4 gains
the extra 64 bytes of RAM.  It also gets more ROM (4K total), but the
'03 is ROMless so no real difference there.

Here's a quick summary of Timer Control Register 2 @ $18:

  Bit 7: Enable Input Capture Interrupt 2
  Bit 6: Enable Input Capture Interrupt 1
  Bit 5: Enable Output Compare Interrupt 3
  Bit 4: Enable Output Compare Interrupt 2
  Bit 3: Enable Output Compare Interrupt 1
  Bit 2: Enable Timer Overflow Interrupt
  Bit 1: Read only - reads as 1
  Bit 0: Read only - reads as 1

>From the above, I'm sure there must be other differences.  I don't have
time to do a detailed comparison right now.  I can look up other stuff
as needed, however I don't have a scanner and thus can't send you the
full data sheet.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/