ST7FOXU0 datasheet(89/123 Pages) STMICROELECTRONICS

89 / 123 page

ST7FOXU0

Instruction set

89/123

11.2.1

Illegal opcode reset

In order to provide enhanced robustness to the device against unexpected behavior, a

system of illegal opcode detection is implemented: a reset is generated if the code to be

executed does not correspond to any opcode or prebyte value. This, combined with the

Watchdog, allows the detection and recovery from an unexpected fault or interference.

A valid prebyte associated with a valid opcode forming an unauthorized combination does

not generate a reset.

Table 38.

Illegal opcode detection

Mnemo

Description

Function/Example

Dst

Src

ADC

Add with Carry

A = A + M + C

ADD

Addition

A = A + M

AND

Logical And

A = A . M

BCP

Bit compare A, Memory

tst (A . M)

BRES

Bit Reset

bres Byte, #3

BSET

Bit Set

bset Byte, #3

BTJF

Jump if bit is false (0)

btjf Byte, #3, Jmp1

BTJT

Jump if bit is true (1)

btjt Byte, #3, Jmp1

CALL

Call subroutine

CALLR

Call subroutine relative

CLR

Clear

reg, M

Arithmetic Compare

tst(Reg - M)

reg

CPL

One Complement

A = FFH-A

reg, M

DEC

Decrement

dec Y

reg, M

HALT

Halt

IRET

Interrupt routine return

Pop CC, A, X, PC

INC

Increment

inc X

reg, M

Absolute Jump

jp [TBL.w]

JRA

Jump relative always

JRT

Jump relative

JRF

Never jump

jrf *

JRIH

Jump if ext. interrupt = 1

JRIL

Jump if ext. interrupt = 0

JRH

Jump if H = 1

H = 1 ?

JRNH

Jump if H = 0

H = 0 ?

JRM

Jump if I = 1

I = 1 ?

JRNM

Jump if I = 0

I = 0 ?

JRMI

Jump if N = 1 (minus)

N = 1 ?

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