I am using Keil compiler along with Silabs IDE for programming Silicon labs C8051F340. In the C Code, when I define an array of size greater than 64 bytes, the code doesn't execute properly.

char myalarms[]="ALARM1XXXXxxxxxxxxxxALARM2XXXXxxxxxxxxxxALARM3XXXXxxxxxxxxxxALAR";
L=0x1200;

Compiles fine. If I insert a break at both the lines, it first stops at the first line, continues to second break point a L=.. line and then proceeds further, without issues.

But if I change the total characters to 65 (it is 64 in the above example) then the execution stops at the first breakpoint, ie: the array definition, and then it just seems to be coninuously jumping to the same line when I press the 'go' button.

char myalarms[]="ALARM1XXXXxxxxxxxxxxALARM2XXXXxxxxxxxxxxALARM3XXXXxxxxxxxxxxALAR";

char alarms1[]="ALARM4XXXXxxxxxxxxxxALARM5XXXXxxxxxxxxxxALARM6XXXXxxxxxxxxxx";

L=0x1200;

If the code is as above, and if I insert breakpoints at all 3 lines, then the program counter pointer reaches the first line, and then executes it fine and moves to the second. When it reaches the second line, and if I press continue, it goes back to the first line and loops there. The first array is 64 bytes long. This issue gets solved if I reduce the size of first array to 62 bytes and the second array to just to bytes, totalling 64 bytes.

Is is some limitation of compiler or am I doing something stupid? Keil C compiler doesn't say anything about max size being limited to 64 bytes. 64 bytes is too low!!