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That's it Ttelmah !

If the code is checking the input bit, then a software UART is being used.

I tried with just adding "bits=8" to the use_rs232 statement, but that was not enough ...

Thanks for your answer.

I've added the "errors" option, and flushed the buffer and the flag before enabling interrupts, as you suggested, but there's still no interrupt.

Yes, on 18F4 ...

Hi all,

I'm developing software for a 18F4550 with CCS v. 3.249, and I have a strange problem with the UART receive interrupt.
The built-in serial functions (putchar, getch, kbhit...) work fine, b ...

Ok, thanks John and Ttelmah,

I've taken a closer look at the CPU clock chain.

My external oscillator provides a 24MHz frequency, so I configured
#fuses with:
- HSPLL and USBDIV: because I pl ...

Hi all,

I'm working on a 18F4550-based custom board, using CCS C Compiler v3.249, and I wanted to have some explanations on the #use rs232 directive, concerning the baudrate.

My "problem&qu ...