ST72345C4 datasheet(193/247 Pages) STMICROELECTRONICS

193 / 247 page

ST72344xx, ST2345xx

Instruction set

Doc ID 12321 Rev 6

193/247

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 1 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

submodes:

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 submodes:

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.

ST72345C4 Folha de dados(PDF) 193 Page - STMicroelectronics