11. When a branch is " not taken ", the CPU's program counter is unchanged. 12. Other computing architectures go much further, attempting to bypass the alternatives to the program counter . 13. Register R1 has the special use of being the program counter for the interrupt handler. 14. Internally, the HC11 instruction set is upward compatible with the pointer, and a program counter . 15. At this point, sharing the program counter completely breaks any kind of rational programming paradigm. 16. The low-order byte is an offset relative to the current location of the program counter . 17. R6 was the stack pointer, R7 the program counter . 18. The 10-bit program counter is accessible as R2. 19. I think it is asking if a thread and parent can use the same program counter . 20. The Program Counter , or PC, is a register that holds the address of the current instruction.