29 Apr
2005
29 Apr
'05
4:50 a.m.
Datasheets for the Harris version of the UART (HD6402) specify a maximum clock rate of 2
MHz and hence a maximum baud rate of 125 KHz (2000/16).
If the current baud rate generator crystal is greater than 16*4800=76.8KHz then it (may)
be possible to simply bypass some dividers on the board rather than finding/installing a
new crystal.
Wai-Sun Chia wrote:
On 4/29/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Not necesarily. The 6402 takes external transmit
and receive clocks, at
16 times the desirted baud rate. If the clock generator hardware can't go
faster than 16*4800 for some reason, then you won't get more than 4800
baud. This is probalby very easy to modify, though.
Sorry to sound simplistic, but does that mean if I just whack in an
appropriate crystal, then I'd magically get 9600? (haven't downloaded
the prints yet)
Recommendations for an appropriate crystal would be very much appreciated! :-)
How much do you think I could up it to? 19k2?
/ws