PM0044 datasheet(48/162 Pages) STMICROELECTRONICS

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STM8 addressing modes

PM0044

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Doc ID 13590 Rev 3

6.8

Indirect Indexed (Short Pointer Long, Long Pointer Long,

Long Pointer Extended) addressing mode

This is a combination of indirect and indexed addressing mode. The data byte required for

the operation is found by its memory address, which is defined by the unsigned addition of

an index register value (X or Y) with a pointer value located in memory. The pointer address

follows the op-code.

The indirect indexed addressing mode is made of four sub-modes:

Table 31.

Overview of Indirect indexed instructions

Addressing mode

Syntax

EA formula

Ptr Adr

Ptr Size

Dest adr

Short Pointer

Long

Indirect

Indexed ([shortptr.w],ndx) ((shortptr.w) + ndx) 00..FF

Word

000000.01FFFE

Long Pointer

Long

Indirect

Indexed ([longptr.w],ndx)

([longptr.w] +ndx)

00..FFFF

Word

000000.01FFFE

Long Pointer

Extended

Indirect

Indexed ([longptr.e],ndx)

([longptr.e] +ndx)

00..FFFF

Extword

000000.FFFFFE

Table 32.

Available Long Pointer Long and Short Pointer Long Indirect

Indexed instructions

Instructions

Functions

LD, LDW

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Addition/Subtraction operations

BCP

Bit Compare

CALL, JP

Call or Jump subroutine

Table 33.

Available Long Pointer Long Indirect Indexed instructions

Instructions

Functions

CLR

Clear

TNZ

Test Negative or Zero

CPL, NEG

1’s or 2’s Complement

SLA,SLL, SRL, SRA, RLC, RRC

Shift and Rotate Operations

SWAP

Swap Nibbles

INC, DEC

Increment/Decrement

Table 34.

Long Pointer Extended Indirect Indexed instructions instruction

Instructions

Functions

LDF

Far load

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