ST7293C3B1 datasheet(35/69 Pages) STMICROELECTRONICS

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ST7294

Indirect Indexed (short, long):

This is a combination of indirect and short indexed

addressing mode. The required data byte to do

the operation is found by its memory address,

which is defined by the unsigned addition of an in-

dex register value (X or Y) with a pointer value lo-

cated in memory. The pointer address follows the

op-code.

Long and Short

Indi rect Indexed

Instructions

Function

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Additions/Sub-

stractions operations

BCP

Bit Compare

Short Indir ect Indexed

Instructions Only

Function

CLR

Clear

INC, DEC

Increment/Decrement

TNZ

Test Negative or Zero

CPL, NEG

1 or 2 Complement

BSET, BRES

Bit Operations

BTJT, BTJF

Bit Test and Jump Opera-

tions

SLL, SRL, SRA, RLC,

RRC

Shift and Rotate Opera-

tions

SWAP

Swap Nibbles

CALL, JP

Call or Jump subroutine

The indirect indexed addressing mode consists of

two sub-modes:

Indirect Indexed (short) :

The pointer address is a byte, the pointer size is a

byte, thus allowing 00..1FE addressing space,

and requires 1 byte after the op-code.

Indirect Indexed (long) :

The pointer address is a byte, the pointer size is a

word, thus allowing 64Kbytes addressing space,

and requires 1 byte after the op-code.

Relative mode (direct, indirect):

This addressing mode is used to modify the PC

it.

The relative addressing mode consists of two sub-

modes:

Relative (direct):

The offset is following the op-code.

Relative (indirect):

The offset is defined in memory, which address

follows the op-code.

Available Relative

Direct/Indirect

Instructions

Fun ction

JRxx

Conditional Jump

CALLR

Call Relative

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