#use rs232 problem

[eaton]

#use delay(clock=20000000)
#use rs232(baud=115200,xmit=PIN_C6,rcv=PIN_C7)

hello,
using the lines above i get the "USE parameter value is out of range "0X10" " error. I have used this exactly as written with no problems in the past.

using a pic18f252 at 20 MHz
compiler v=3.169

what am i missing?
as always, any help is greatly appreciated

[dyeatman]

I compiled it in 3.169, 3.189 and 3.221 with no problems.

[Humberto]

Just to have a clue, did you try with:

#use delay(clock=10000000)

or

#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)


Humberto

[webbone]

You will need to use the BRGH10K option in your #USE RS232 directive.

Doing so should allow you to get a baud rate of 113636 which is about 1.4% below your desired rate - this should be tolerable by most serial ports that are running off of accurate clocks (if I recall correctly a +/- 1.5% error is allowable).

If you don't need the speed of 20MHz you could go for a lower clock frequency that makes 115200 on the nose such as 18.432 MHz.

Check the data sheet for your processor, section 16.1, for more details on baud rate calculation.