ST7263BEx datasheet(133/186 Pages) STMICROELECTRONICS

133 / 186 page

ST7263Bxx

Instruction set

Doc ID 7516 Rev 8

133/186

Indexed (Short)

The offset is a byte, thus requires only one byte after the opcode and allows 00 - 1FE

addressing space.

Indexed (long)

The offset is a word, thus allowing 64 Kbyte addressing space and requires 2 bytes after the

opcode.

12.1.5

Indirect (Short, Long)

The required data byte to do the operation is found by its memory address, located in

memory (pointer).

The pointer address follows the opcode. The indirect addressing mode consists of two sub-

modes:

Indirect (short)

The pointer address is a byte, the pointer size is a byte, thus allowing 00 - FF addressing

space, and requires 1 byte after the opcode.

Indirect (long)

The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing

space, and requires 1 byte after the opcode.

12.1.6

Indirect Indexed (Short, Long)

This is a combination of indirect and short indexed addressing modes. The operand is

referenced by its memory address, which is defined by the unsigned addition of an index

the opcode.

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 opcode.

Indirect Indexed (Long)

The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing

space, and requires 1 byte after the opcode.

Table 51.

Instructions supporting Direct, Indexed, Indirect and Indirect Indexed

addressing modes

Long and Short instructions

Function

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Addition/subtraction operations

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