ST7FOXU0 datasheet(86/123 Pages) STMICROELECTRONICS

86 / 123 page

Instruction set

ST7FOXU0

86/123

Indexed mode (Long)

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

opcode.

11.1.5

Indirect modes (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 mode (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 mode (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.

11.1.6

Indirect indexed modes (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 mode (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 mode (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 35.

Instructions supporting direct, indexed, indirect and indirect indexed

addressing modes

Instructions

Function

Long and short instructions

Load

Compare

AND, OR, XOR

Logical operations

ADC, ADD, SUB, SBC

Arithmetic addition/subtraction operations

BCP

Bit compare

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