W65C02S Datasheet, PDF (7/40 Pages) List of Unclassifed Manufacturers – Microprocessor

The Western Design Center, Inc.
W65C02S Data Sheet
The 16-bit Program Counter Register (PC) provides the addresses which are used to step the microprocessor through
sequential program instructions. This register is incremented each time an instruction or operand is fetched from
program memory.
2.8 Stack Pointer Register (S)
The Stack Pointer Register (S) is an 8-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.
A0-A15
D0-D7
INDEX X
(8 BITS)
INDEX Y
(8 BITS)
STACK POINTER
(S) (8 BITS)
ALU
(8 BITS)
ACCUMULATOR
(A) ( 8BITS)
PROG. COUNTER
(PC) (16 BITS)
PROCESSOR
STATUS
(P) 8 BITS
DATA
LATCH
INTERRUPT
LOGIC
TIMING
CONTROL
IRQB
NMIB
RESB
PHI2
INSTRUCTION
DECODE
BE ^SYSTEM
CONTROL
INSTRUCTION REGISTER
(8 BITS)
BE
RWB
RDY
VPB
SYNC
Figure 2-1 W65C02S Internal Architecture Simplified Block Diagram
The Western Design Center, Inc.
W65C02S Data Sheet
7