W65C816S Datasheet, PDF (10/62 Pages) List of Unclassifed Manufacturers – Microprocessor

The Western Design Center, Inc.
W65C816S Data Sheet
2.11 Program Counter (PC)
The 16-bit Program Counter (PC) Register provides the addresses which are used to step the microprocessor
through sequential 8-bit program instruction fields. The PC is incremented for each 8-bit instruction field that is
fetched from program memory.
2.12 Stack Pointer (S)
The Stack Pointer (S) is a 16-bit register which is used to indicate the next available location in the stack memory
area. It serves as the effective address in stack addressing modes as well as subroutine and interrupt processing.
The Stack Pointer provides simple implementation of nested subroutines and multiple -level interrupts. During
Emulation mode, the S High-order byte (SH) is always equal to one. The bank address for all stack operations is
Bank zero.
The Western Design Center
W65C816S
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