PM0044 datasheet(34/162 Pages) STMICROELECTRONICS

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STM8 addressing modes

PM0044

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Doc ID 13590 Rev 3

Figure 7.

Immediate addressing mode example

6.3

Direct addressing mode (Short, Long, Extended)

The data byte required for the operation is found by its memory address, which follows the

op-code.

Direct addressing mode is made of three sub-modes:

Previous Value

05BE

Steps to Determine

Effective Address

PC = 05BE

PC = PC + 1 = 05BF

EA = PC = 05BF

New PC = PC + 1

= 05C0

Before Completion

05C0

New PC

Instruction Complete

A = (EA) = F8

New PC = 05C0

After Completion

LD A, #0F8h

05BE

05BF

05C0

05BE

05BF

05C0

VR02059A

Table 20.

Overview of Direct addressing mode instructions

Addressing mode

Syntax

EA formula

Ptr Adr

Ptr Size

Dest adr

Short

Direct

shortmem

(shortmem)

op + 1

Byte

00..FF

Long

Direct

longmem

(longmem)

op + 1..2

Word

0000..FFFF

Extended

Direct

extmem

(extmem)

op + 1..3

Ext word

000000..FFFFFF

Table 21.

Available Long and Short Direct addressing mode instructions

Instructions

Functions

LD, LDW

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC, ADDW, SUBW

Arithmetic Addition/Subtraction operations

BCP

Bit Compare

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