ST7LUS5 datasheet(86/124 Pages) STMICROELECTRONICS

86 / 124 page

Instruction set

ST7LUS5, ST7LU05, ST7LU09

86/124

11.1.7

Relative mode (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 follows the opcode.

Relative (indirect)

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

11.2

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 59:

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 57.

Instructions supporting direct, indexed, indirect and indirect indexed

addressing modes (continued)

Type

Instruction

Function

Table 58.

Available relative direct/indirect instructions

Instruction

Function

JRxx

Conditional Jump

CALLR

Call Relative

Table 59.

Instruction groups

Group

Instructions

Load and Transfer

CLR

Stack operation

PUSH

POP

RSP

Increment/Decrement

INC

DEC

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