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Cortext M3 Program Counter

Muhammad Ahsan
Note: This was originally posted on 21st March 2011 at http://forums.arm.com

Hello all,
I am using Cortex M3 (which support only Thumb-2 Instruction Set). I want to let the PC to jump to a particular address. When I try to use PC as destination register to move the address in the PC, a fault exception occurs. I have read the Ref. Manual but could not find any restrictions that may apply on PC. I am using IAR IDE. Any help would be highly appreciated.
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  • Note: This was originally posted on 22nd March 2011 at http://forums.arm.com

    The addresses where I want PC to jump have anding 0x..5 and 0x...A, which i assume are odd. While reading I also came across that the address should be word aligned, which means ending of address should be 0, 4, 8, or C. I also read that the bit 0 of the address where the PC should jump must be 1, which is contradiction with the earlier statement. Either I am not understanding it properly or there is some mistake. Anybody has any explaination of it?


    Make sure the address is odd.
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  • Note: This was originally posted on 22nd March 2011 at http://forums.arm.com

    The addresses where I want PC to jump have anding 0x..5 and 0x...A, which i assume are odd. While reading I also came across that the address should be word aligned, which means ending of address should be 0, 4, 8, or C. I also read that the bit 0 of the address where the PC should jump must be 1, which is contradiction with the earlier statement. Either I am not understanding it properly or there is some mistake. Anybody has any explaination of it?


    Make sure the address is odd.
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