ST7LITE20F2 datasheet(112/166 Pages) STMICROELECTRONICS

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Instruction set

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

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Doc ID 8349 Rev 5

12.1.2

Immediate

Immediate instructions have two bytes: The first byte contains the opcode and the second

byte contains the operand value.

12.1.3

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 requiring 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.

12.1.4

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 indexed addressing mode consists of three submodes:

●

Indexed (no offset)

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

space.

●

Indexed (short)

The offset is a byte, thus requiring 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.

SLL, SRL, SRA, RLC, RRC

Shift and Rotate operations

SWAP

Swap nibbles

Table 50.

Inherent instructions (continued)

Instruction

Function

Table 51.

Immediate instructions

Instruction

Function

Load

Compare

BCP

Bit Compare

AND, OR, XOR

Logical operations

ADC, ADD, SUB, SBC

Arithmetic operations

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