M68HC05 datasheet(82/118 Pages) FREESCALE

tên linh kiện	M68HC05

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Instruction Set

MC68HC05C9A Advance Information Data Sheet, Rev. 4.1

Freescale Semiconductor

11.3.2 Read-Modify-Write Instructions

These instructions read a memory location or a register, modify its contents, and write the modified value

back to the memory location or to the register.

NOTE

Do not use read-modify-write operations on write-only registers.

Table 11-2. Read-Modify-Write Instructions

Instruction

Mnemonic

Arithmetic Shift Left (Same as LSL)

ASL

Arithmetic Shift Right

ASR

Bit Clear

BCLR(1)

1. Unlike other read-modify-write instructions, BCLR and

BSET use only direct addressing.

Bit Set

BSET(1)

Clear Register

CLR

Complement (One’s Complement)

COM

Decrement

DEC

Increment

INC

Logical Shift Left (Same as ASL)

LSL

Logical Shift Right

LSR

Negate (Two’s Complement)

NEG

Rotate Left through Carry Bit

ROL

Rotate Right through Carry Bit

ROR

Test for Negative or Zero

TST(2)

2. TST is an exception to the read-modify-write sequence

because it does not write a replacement value.

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