Our latest RX63N project uses twelve serial ports (SCI1 through SCI12).
All of our serial communicate interfaces start with the example code provided by Renesas.
The first four serial ports (SCI1, SCI2, SCI3 and SCI4) communicate through a current loop interface to eight peripheral devices each.
These four serial ports work properly after testing and debugging.
The next four serial ports (SCI5, SCI6, SCI7 and SCI8) communicate through an RS232 interface to one master device each.
When a message is sent from the master device, the application goes to sleep.
When the e2studio IDE is paused, the debugger shows that the current location is the Excep_UndefinedInst function.
The problem occurs on the first received character, which can be seen in the receive data register.
If I turn off the receive interrupt but leave the receiver enabled, the application continues to run properly, and the sent character can be seen in receive data register.
All four ports exhibit the same behavior.
They all fail on the first received character.
It appears that the interrupt service functions are not being located properly in the vector table.
Our RAM usage is at 98% of the 256K of data memory, and our ROM usage is at 10% of the 2MB of flash memory.
The configuration settings for the serial ports appears to be correct, and we are able to receive one character of data at the specified communication parameters into the receive data register.
What would cause the application to fail to find the interrupt service function?
Any help in resolving this problem would be greatly appreciated.
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