Running the Program

Push F10 to execute one instruction. The first instruction executes, loading register R8 with a 2 (see the register display). The PC advances to the next instruction 0x00400004 and the message display window shows the instruction that just executed.

Push F10 two more times to execute the remaining instructions. Each instruction is 32 bits (four bytes) long, so the PC changes by four each time. After the third instruction, R8 will have the sum of two plus three.