PM0044 datasheet(147/162 Pages) STMICROELECTRONICS

147 / 162 page

PM0044

STM8 instruction set

Doc ID 13590 Rev 3

147/162

Syntax

SRA dst

e.g. SRA (X)

Operation

Description

The destination is either a memory byte or a register. It performs an signed

division by 2: The sign bit 7 is not modified.This instruction is compact, and

does not affect any register when used with RAM variables.

Instruction overview

⇒

Set if bit 7 of the result is set (negative value), cleared otherwise.

⇒

R7.R6.R5.R4.R3.R2.R1.R0

Set if the result is zero (0x00), cleared otherwise.

⇒

Set if, before the shift, the LSB of register or memory was set, cleared

otherwise.

Detailed description

See also: SRAW, SRL, SLL, RRC, RLC, SWAP

SRA

Shift Right Arithmetic

SRA

mnem

dst

Affected condition flags

VI1

SRA

Reg

bit0

SRA

Mem

bit0

dst

Asm

lgth

Op-code(s)

ST7

ASRA A

✗

shortmem

SRA $15

✗

longmem

SRA $1505

(X)

SRA (X)

✗

(shortoff,X)

SRA ($15,X)

✗

(longoff,X)

SRA ($1505,X)

(Y)

SRA (Y)

✗

(shortoff,Y)

SRA ($15,Y)

✗

(longoff,Y)

SRA ($1505,Y)

(shortoff,SP)

SRA ($15,SP)

✗

[shortptr.w]

SRA [$15]

✗

[longptr.w]

SRA [$1505].w

([shortptr.w],X)

SRA ([$15],X)

✗

([longptr.w],X)

SRA ([$1505.w],X)

([shortptr.w],Y)

SRA ([$15],Y)

✗

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