ST7MC1K2-Auto datasheet(308/371 Pages) STMICROELECTRONICS

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11.2

Instruction groups

11.2.1

Introduction

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:

Using a prebyte

The instructions are described with one to four opcodes.

In order to extend the number of available opcodes for an 8-bit CPU (256 opcodes), three

different prebyte opcodes are defined. These prebytes modify the meaning of the instruction

they precede.

The whole instruction becomes:

Table 184.

Instruction groups

Group

Instructions

Load and transfer

CLR

Stack operation

Push

Pop

RSP

Increment/decrement

INC

DEC

Compare and tests

TNZ

BCP

Logical operations

AND

XOR

CPL

NEG

Bit operation

BSET

BRES

Conditional bit test and branch

BTJT

BTJF

Arithmetic operations

ADC

ADD

SUB

SBC

MUL

Shift and rotates

SLL

SRL

SRA

RLC

RRC

SWAP

SLA

Unconditional jump or call

JRA

JRT

JRF

CALL

CALLR

NOP

RET

Conditional branch

JRxx

Interruption management

TRAP

WFI

HALT

IRET

Condition code flag modification

SIM

RIM

SCF

RCF

PC-2

End of previous instruction

PC-1

Prebyte

opcode

PC+1

Additional word (0 to 2) according to the number of bytes required to

compute the effective address

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