At 01:52 AM 6/14/96 +1100, you wrote:
>>I want a 15.2K baud link. Failing this, 57600 or even 38.4K baud.
>>For this application a software UART is out of the question,
>>(Though it can be achieved, it is just not suitable.)
>>
>>Questions:
>>
>>1) Can the UART in the PIC16C64/65/74 WORK CORRECTLY at these high baud
>>   rates? This would require BRGH =1 and isn't this supposed to be bugged?
>>   Do any of the devices work as stated? Are there work-arounds?
>>
>
>I have been using the 16C74 at 156250 bps for an RS485 multidrop network for
>some time now and not experienced any problems with BRGH=1.
>
> I can't speak for the other parts. But I can recommend the 16C74.
>

 I dont know about your application, but I have had many problems with the
 BRGH set. My product must be used on any PC, and works fine on 95% on the PCs
 out there. A customer loaned me a laptop that would not work with my product.
 After doing all the engineering stuff, like analyzing data stream, code, and
 pulling my hair out, I decided to review the April 96 errata on the 74. One
now-documented-feature was that the user "may see a high number of
communication
 errors" if the BRGH is set.

 So, to make a long story short, I replaced the xtal with a 7.3728mhz,
changed the
 firmware, and it fixed the problem. Thank you Mchip.

 Note that the problem only occured after sending about 7k of continuous data.

 Richard

 Parallax Inc, t - 1.5 days