PM0044 datasheet(113/162 Pages) STMICROELECTRONICS

113 / 162 page

PM0044

STM8 instruction set

Doc ID 13590 Rev 3

113/162

Syntax

JRxx dst

e.g. JRxx loop

Operation

PC = PC+lgth

PC <= PC + dst, if Condition is True

Description

Conditional relative jump. PC is updated by the signed addition of PC and

dst, if the condition is true. Control, then passes to the statement

addressed by the program counter. Else, the program continues normally.

Instruction overview

Instruction List

Detailed description

JRxx

Conditional Jump

Relative Instruction

JRxx

mnem

dst

Affected condition flags

VI1

JRxx

Mem

mnem

meaning

sym

Condition

Op-code (OC)

JRC

Carry

C = 1

JREQ

Equal

Z = 1

JRF

False

JRH

Half-Carry

H = 1

JRIH

Interrupt Line is High

JRIL

Interrupt Line is Low

JRM

Interrupt Mask

I = 1

JRMI

Minus

< 0

N = 1

JRNC

Not Carry

C = 0

JRNE

Not Equal

<> 0

Z = 0

JRNH

Not Half-Carry

H = 0

JRNM

Not Interrupt Mask

I = 0

JRNV

Not Overflow

V = 0

JRPL

Plus

>= 0

N = 0

JRSGE

Signed Greater or Equal

(N XOR V) = 0

JRSGT

Signed Greater Than

(Z OR (N XOR V)) = 0

JRSLE

Signed Lower or Equal

(Z OR (N XOR V)) = 1

JRSLT

Signed Lower Than

(N XOR V) = 1

JRT

True

JRUGE

Unsigned Greater or Equal

C = 0

JRUGT

Unsigned Greater Than

C = 0 and Z = 0

JRULE

Unsigned Lower or Equal

C = 1 or Z = 1

JRC

Carry

C = 1

JRULT

Unsigned Lower Than

C = 1

JRV

Overflow

V = 1

dst

Asm

lgth

Op-code(s)

ST7

shortoff

JRxx $15

1/2

Op-code

✗

shortoff

JRxx $15

1/2

Op-code

✗

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