W65C02S 查看數據表（PDF） - Unspecified

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W65C02S

8-bit Microprocessor

Unspecified 

The Western Design Center, Inc.

W65C02S Data Sheet

4.4 Absolute Indexed with Y a, y

With the Absolute Indexed with Y addressing mode, the Y Index Register is added to the second and third bytes of the

instruction to form the 16-bit effective address.

Byte:

Instruction:

2

ADH

1

ADL

0

OpCode

Operand address:

4.5 Absolute Indirect (a)

ADH

ADL

+

Y

effective address

With the Absolute Indirect addressing mode, the second and third bytes of the instruction form an address to a pointer. This

address mode is only used with the JMP instruction and the Program Counter is loaded with the first and second bytes at this

pointer.

Byte:

Instruction:

2

ADH

1

ADL

0

OpCode

Indirect address:

ADH

ADL

New PC value:

indirect address

4.6 Accumulator A

With Accumulator addressing the operand is implied as the Accumulator and therefore only a single byte forms the

instruction..

Byte:

Instruction:

2

1

0

OpCode

Operand:

4.7 Immediate Addressing #

With Immediate Addressing the operand is the second byte of the instruction.

accumulator

Byte:

Instruction:

2

1

0

Operand OpCode

Operand:

Operand

4.8 Implied i

Implied addressing uses a single byte instruction. The operand is implicitly defined by the instruction.

Byte:

Instruction:

2

1

0

OpCode

Operand address:

implied

The Western Design Center, Inc.

W65C02S Data Sheet

17

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