HC705J2 datasheet(32/78 Pages) MOTOROLA

32 / 78 page

MC68HC705J2

CENTRAL PROCESSOR UNIT

MOTOROLA

4-13

Table 4-7. Register/Memory Instructions

Instruction

Mnemonic

Load Accumulator from Memory

LDA

Load Index Register from Memory

LDX

Store Accumulator in Memory

STA

Store Index Register in Memory

STX

Add Memory to Accumulator

ADD

Add Memory and Carry to Accumulator

ADC

Subtract Memory

SUB

Subtract Memory from Accumulator with Borrow

SBC

AND Memory with Accumulator

AND

OR Memory with Accumulator

ORA

Arithmetic Compare Accumulator with Memory

CMP

Arithmetic Compare Index Register with Memory

CPX

Bit Test Memory with Accumulator (Logical Compare)

BIT

Multiply

MUL

4.4.2 Read-Modify-Write Instructions

These instructions read a memory location or a register, modify its contents, and

write the modified value back to memory or to the register. The test for negative

or zero (TST) instruction is an exception to the read-modify-write sequence

because it does not write a replacement value. Read-modify-write instructions

use the following addressing modes:

• Inherent

• Direct

• Indexed, no offset

• Indexed, 8-bit offset

Table 4-8 lists the read-modify-write instructions.

HC705J2 Datasheet(PDF) 32 Page - Motorola, Inc

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