PCDIDE COMPILER Custom Computer Services Inc (CCS), PCDIDE COMPILER Datasheet - Page 359

• Manufacturer Part Number: PCDIDE COMPILER
• Description: PCD C-COMPILER PIC24, DSPIC
• Manufacturer: Custom Computer Services Inc (CCS)
• Type: Compilerr

Specifications of PCDIDE COMPILER

• For Use With/related Products: Microchip PIC24/dsPIC®
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 429-1008

Why is the RS-232 not working right?
1. The PIC® is Sending Garbage Characters.
2. The PIC® is Receiving Garbage Characters.
3. Nothing is Being Sent.
A. Check the clock on the target for accuracy. Crystals are usually not a problem but RC
oscillators can cause trouble with RS-232. Make sure the #USE DELAY matches the actual
clock frequency.
B. Make sure the PC (or other host) has the correct baud and parity setting.
C. Check the level conversion. When using a driver/receiver chip, such as the MAX 232, do
not use INVERT when making direct connections with resistors and/or diodes. You probably
need the INVERT option in the #USE RS232.
D. Remember that PUTC(6) will send an ASCII 6 to the PC and this may not be a visible
character. PUTC('A') will output a visible character A.
A. Check all of the above.
A. Make sure that the tri-state registers are correct. The mode (standard, fast, fixed) used will
be whatever the mode is when the #USE RS232 is encountered. Staying with the default
STANDARD mode is safest.
B. Use the following main() for testing:
Check the XMIT pin for activity with a logic probe, scope or whatever you can. If you can look at it
with a scope, check the bit time (it should be 1/BAUD). Check again after the level converter.
main() {
}
while(TRUE)
putc('U');
345