ST7FLITE25F1B6 datasheet(113/166 Pages) STMICROELECTRONICS

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Instruction set

Doc ID 8349 Rev 5

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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.

Table 52.

Long and short 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 Additions/Subtractions operations

BCP

Bit Compare

Table 53.

Short instructions supporting direct, indexed, indirect and indirect

indexed addressing modes

Short instructions only

Function

CLR

Clear

INC, DEC

Increment/Decrement

TNZ

Test Negative or Zero

CPL, NEG

1 or 2 Complement

BSET, BRES

Bit operations

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