ST7294 datasheet(33/69 Pages) STMICROELECTRONICS

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ST7294

Inherent:

All related instructions are single byte ones. The

op-code fully specify all required information for

the CPU to process the operation. These instruc-

tions are single byte ones.:

Immediate:

The required data byte to do the operation is fol-

lowing the op-code. These are two byte instruc-

tions, one for the opcode and the other one for the

immediate data byte.

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

Direct (short, long):

The data byte required to carry out the operation is

found by its memory address, which follows the

op-code.

The direct addressing mode consists of two sub-

modes:

Direct (short):

The address is a byte, thus require only one byte

after the op-code, but only allow 00..FF address-

ing space.

Direct (long):

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

dressing space, but requires 2 bytes after the op-

code.

Available Long and

Short Direct Instructions

Fun ction

Load

Compare

AND, OR, XOR

Logical Operations

ADC, ADD, SUB, SBC

Arithmetic Additions/Sub-

stractions operations

BCP

Bit Compare

Short Direct

Instructions Only

Fun ction

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

ST7294 数据表(PDF) 33 Page - STMicroelectronics

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