ST7FOXU0 datasheet(85/123 Pages) STMICROELECTRONICS

85 / 123 page

ST7FOXU0

Instruction set

85/123

11.1.2

Immediate mode

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

contains the operand value.

Imm

11.1.3

Direct modes

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

The direct addressing mode consists of two submodes:

Direct (Short) addressing mode

The address is a byte, thus requires only 1 byte after the opcode, but only allows 00 - FF

addressing space.

Direct (Long) addressing mode

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

the opcode.

11.1.4

Indexed modes (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 mode (No Offset)

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

Indexed mode (Short)

The offset is a byte, thus requires only 1 byte after the opcode and allows 00 - 1FE

addressing space.

MUL

Byte multiplication

SLL, SRL, SRA, RLC, RRC

Shift and rotate operations

SWAP

Swap nibbles

Table 33.

Instructions supporting inherent addressing mode (continued)

Instruction

Function

Table 34.

Instructions supporting inherent immediate addressing mode

Immediate Instruction

Function

Load

Compare

BCP

Bit compare

AND, OR, XOR

Logical operations

ADC, ADD, SUB, SBC

Arithmetic operations

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