Instruction Pointer - Intel 80C186EA User Manual

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OVERVIEW OF THE 80C186 FAMILY ARCHITECTURE

Instruction Pointer

The Bus Interface Unit updates the 16-bit Instruction Pointer (IP) register so it contains the offset

of the next instruction to be fetched. Programs do not have direct access to the Instruction Pointer,

but it can change, be saved or be restored as a result of program execution. For example, if the

Instruction Pointer is saved on the stack, it is first automatically adjusted to point to the next in-

struction to be executed.

Reset initializes the Instruction Pointer to 0000H. The CS and IP values comprise a starting exe-

cution address of 0FFFF0H (see "Logical Addresses" on page 2-10 for a description of address

Figure 2-4. Segment Registers

Code Segment

Data Segment

Stack Segment

Extra Segment