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W65C02SQ-14

8-bit Microprocessor

Unspecified 

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

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