ST72325AR7-Auto datasheet(185/243 Pages) STMICROELECTRONICS

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ST72325xxx-Auto

Instruction set

Doc ID 13770 Rev 3

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18.1.7

Relative (direct, indirect)

This addressing mode is used to modify the PC register value, by adding an 8-bit signed

offset to it.

The relative addressing mode consists of two submodes:

Relative (direct)

The offset is following the opcode.

Relative (indirect)

The offset is defined in memory, which address follows the opcode.

18.2

Instruction groups

The ST7 family devices use an Instruction Set consisting of 63 instructions. The instructions

may be subdivided into 13 main groups as illustrated in the following table:

Short instructions only

CLR

Clear

INC, DEC

Increment/Decrement

TNZ

Test Negative or Zero

CPL, NEG

1 or 2 Complement

BSET, BRES

Bit Operations

BTJT, BTJF

Bit Test and Jump Operations

SLL, SRL, SRA, RLC, RRC Shift and Rotate Operations

SWAP

Swap Nibbles

CALL, JP

Call or Jump subroutine

Table 101.

Instructions supporting direct, indexed, indirect, and indirect indexed

addressing modes (continued)

Type

Instruction

Function

Table 102.

Available relative direct/indirect instructions

Instruction

Function

JRxx

Conditional Jump

CALLR

Call Relative

Table 103.

Instruction groups

Group

Instructions

Load and Transfer

CLR

Stack operation

PUSH

POP

RSP

Increment/Decrement

INC

DEC

Compare and Tests

TNZ

BCP

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