ST7MC1K2-Auto datasheet(305/371 Pages) STMICROELECTRONICS

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Instruction set

305/371

11.1.2

Immediate

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

contains the operand value.

11.1.3

Direct

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

The direct addressing mode consists of two sub-modes:

●

Direct (short)

The address is a byte, thus requires 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.

11.1.4

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 indirect addressing mode consists of three sub-modes:

●

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 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.

Table 180.

Immediate instructions

Immediate instruction

Function

Load

Compare

BCP

Bit compare

AND, OR, XOR

Logical operations

ADC, ADD, SUB, SBC

Arithmetic operations

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