ST72561AR7-Auto datasheet(266/324 Pages) STMICROELECTRONICS

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Instruction set

ST72561-Auto

266/324

Doc ID 12370 Rev 8

19.1.2

Immediate

Immediate instructions have 2 bytes, the first byte contains the opcode, the second byte

contains the operand value.

19.1.3

Direct

In direct instructions, the operands are referenced by their memory address.

The direct addressing mode consists of two submodes:

Direct (short)

The address is a byte, thus requires only one byte after the opcode, but only allows 00 - FF

addressing space.

Direct (long)

The address is a word, thus allowing 64 Kbyte addressing space, but requires 2 bytes after

the opcode.

19.1.4

Indexed (no offset, short, long)

In this mode, the operand is referenced by its memory address, which is defined by the

unsigned addition of an index register (X or Y) with an offset.

The indirect addressing mode consists of three submodes:

Indexed (no offset)

There is no offset, (no extra byte after the opcode), and allows 00 - FF addressing space.

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.

19.1.5

Indirect (short, long)

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

memory (pointer).

Immediate instruction

Function

Load

Compare

BCP

Bit compare

AND, OR, XOR

Logical operations

ADC, ADD, SUB, SBC

Arithmetic operations

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