ST7285C datasheet(82/117 Pages) STMICROELECTRONICS

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ST7285C

ST7 ADDRESSING MODES(Cont’d)

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 index regis-

ter value (X or Y) with a pointer value located in

memory. The pointer address follows the op-code.

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 64Kb addressing space, and

requires 1 byte after the op-code.

Relative mode (direct, indirect):

This addressing mode is used to modify the PC

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.

Lon g and Short

Indirect Indexed

Instructions

Function

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Additions/Sub-

stractions operations

BCP

Bit Compare

Short Indirect 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

Available Relative

Direct/Indirect

Instructions

Function

JRxx

Conditional Jump

CALLR

Call Relative

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