L9805 datasheet(87/103 Pages) STMICROELECTRONICS

87 / 103 page

87/103

L9805

INSTRUCTION SET OVERVIEW (Cont’d)

Inherent:

All Inherent instructions consist of a single byte.

The opcode fully specifies all the required informa-

tion for the CPU to process the operation.

Immediate:

Immediate instructions have two bytes, the first

byte contains the opcode, the second byte con-

tains the operand value..

Direct (Short, Long):

In Direct instructions, the operands are referenced

by their memory address, which follows the op-

code.

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 address-

ing space.

Direct (long):

The address is a word, thus allowing 64Kb ad-

dressing space, but requires 2 bytes after the op-

code.

Inherent Instruction

Function

NOP

No operation

TRAP

S/W Interrupt

WFI

Wait For Interrupt (Low Pow-

er Mode)

HALT

Halt Oscillator (Lowest Pow-

er Mode)

RET

Sub-routine Return

IRET

Interrupt Sub-routine Return

SIM

Set Interrupt Mask

RIM

Reset Interrupt Mask

SCF

Set Carry Flag

RCF

Reset Carry Flag

RSP

Reset Stack Pointer

Load

CLR

Clear

PUSH/POP

Push/Pop to/from the stack

INC/DEC

Increment/Decrement

TNZ

Test Negative or Zero

CPL, NEG

1 or 2 Complement

MUL

Byte Multiplication

SLL, SRL, SRA, RLC,

RRC

Shift and Rotate Operations

SWAP

Swap Nibbles

Immediate Instruction

Function

Load

Compare

BCP

Bit Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Operations

Available Long and

Short Direct Instructions

Function

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Additions/Sub-

structions operations

BCP

Bit Compare

Short Direct

Instructions Only

Function

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

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