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The instruction counter is at the lower left. The program counter ( PC ), [ 1 ] commonly called the instruction pointer ( IP ) in Intel x86 and Itanium microprocessors , and sometimes called the instruction address register ( IAR ), [ 2 ] [ 1 ] the instruction counter , [ 3 ] or just part of the instruction sequencer, [ 4 ] is a processor ...
The program counter (PC) is a register that holds the memory address of the next instruction to be executed. After each instruction copy to the memory address register (MAR), the PC can either increment the pointer to the next sequential instruction, jump to a specified pointer, or branch conditionally to a specified pointer. [2]
(Rare) models with >128 KiB of ROM have a 3-byte program counter. Subroutine calls and returns use an additional byte of stack space, there is a new EIND register to provide additional high bits for indirect jumps and calls, and there are new extended instructions EIJMP and EICALL which use EIND:Z as the destination address.
r15 is the program counter, and not usable as a general purpose register; r13 is the stack pointer; r8–r13 can be switched out for others (banked) on a processor mode switch. Older versions had 26-bit addressing, [35] and used upper bits of the program counter (r15) for status flags, making that register 32-bit. ARM 32-bit (Thumb) 8: 16
In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU's control unit that holds the instruction currently being executed or decoded. [1]
In the center of the room, there is a work area containing a simple two function (addition and subtraction) calculator known as the Accumulator and a resettable counter known as the Program Counter. The Program Counter holds the address of the next instruction the Little Man will carry out. This Program Counter is normally incremented by 1 ...
The processor contains 16 16-bit registers, [16] of which four are dedicated to special purposes: R0 is the program counter, R1 is the stack pointer, R2 is the status register, and R3 is a "constant generator" which reads as zero and ignores writes. Added address mode encodings using R3 and R2 allow a total of six commonly used constant values ...
PC (8): Contains the address of the next instruction to execute; known as the program counter register. SW (9): Contains a variety of information, such as carry or overflow flags; known as the status word register. In addition to the standard SIC registers, there are also four additional general-purpose registers specific to the SIC/XE machine: