ST7LITE49K2 datasheet(188/245 Pages) STMICROELECTRONICS

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Instruction set

ST7LITE49K2

188/245

12.2

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:

Using a prebyte

The instructions are described with 1 to 4 bytes.

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 by:

PC-2 End of previous instruction

PC-1 Prebyte

PC Opcode

PC+1 Additional word (0 to 2) according to the number of bytes required to compute

the effective address

These prebytes enable instruction in Y as well as indirect addressing modes to be

implemented. They precede the opcode of the instruction in X or the instruction using direct

addressing mode. The prebytes are:

PDY 90 Replace an X based instruction using immediate, direct, indexed, or inherent

addressing mode by a Y one.

PIX 92 Replace an instruction using direct, direct bit or direct relative addressing mode

to an instruction using the corresponding indirect addressing mode.

It also changes an instruction using X indexed addressing mode to an instruction using

indirect X indexed addressing mode.

PIY 91 Replace an instruction using X indirect indexed addressing mode by a Y one.

Table 67.

ST7 instruction set

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 rotate

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

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