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I understand but as far as EXT_INT1 is not triggered the program should work shouldn't it ?

A little more :
I noticed a difference in the disassembly listing of the RDA2_isr between the versions that work and those that do not :
For those that does not work, each time, the compiler include ...

I tried without the WD but it doesn't change anything

The INT_RDA does not affect TO_UART2_ON :

#INT_RDA //RS232 RECEIVE DATA AVAILABLE - One CHAR is READY to be READ.
void RDA_isr(void)
{
int t;

buffer[next ...

I have a LED on my board so I tried this experience :
The LED is set ON at the beginning of the program and I added the instruction to set it OFF (not toggle) in both the EXT_INT and the EXT1_INT han ...

I agree, it works if I shorten the code in the EXT interrupt handlers. But I’d like to understand.
How the duration of a non executed code can have an influence on the RDA2 interrupt behaviour ?

I am aware of these elements and I stand by what I said.

The problem persists even if RDA2 is the only high priority interrupt.

I had already tried to monitor bits 1 and 2 of RCSTA2 (using #byte ...

a) The HIGH option is not enabled for the external interrupts

b) The EMC is ok and the external interrupts are not triggered.
The problem continues even if I disable those interrupts.

Parts of ...

Hello,

I have a problem for a few days with UART2 ISR in a PIC18LF46k80 project.

I am using a radio module which sends a 5 bytes message to the PIC as a toggle occurs on a pin.
This message is ...