Texas Instruments MSP430x1xx User Manual

Page 366

Instruction Set Overview

B-16

* BR, BRANCH

Branch to .......... destination

Syntax

dst

Operation

dst –> PC

Emulation

MOV

dst,PC

Description

An unconditional branch is taken to an address anywhere in the 64K address
space. All source addressing modes can be used. The branch instruction is
a word instruction.

Status Bits

Status bits are not affected.

Example

Examples for all addressing modes are given.

#EXEC

;Branch to label EXEC or direct branch (e.g. #0A4h)
; Core instruction MOV @PC+,PC

EXEC

; Branch to the address contained in EXEC
; Core instruction MOV X(PC),PC
; Indirect address

&EXEC

; Branch to the address contained in absolute
; address EXEC
; Core instruction MOV X(0),PC
; Indirect address

; Branch to the address contained in R5
; Core instruction MOV R5,PC
; Indirect R5

@R5

; Branch to the address contained in the word
; pointed to by R5.
; Core instruction MOV @R5,PC
; Indirect, indirect R5

@R5+

; Branch to the address contained in the word pointed
; to by R5 and increment pointer in R5 afterwards.
; The next time—S/W flow uses R5 pointer—it can
; alter program execution due to access to
; next address in a table pointed to by R5
; Core instruction MOV @R5,PC
; Indirect, indirect R5 with autoincrement

X(R5)

; Branch to the address contained in the address
; pointed to by R5 + X (e.g. table with address
; starting at X). X can be an address or a label
; Core instruction MOV X(R5),PC
; Indirect, indirect R5 + X