SLAZ290AC October   2012  – May 2021 MSP430F5438A , MSP430F5438A-EP

 

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6.10 CPU28

CPU Module

Category

Compiler-Fixed

Function

PC is corrupted when using certain extended addressing mode combinations

Description

An extended memory instruction that modifies the program counter executes incorrectly when preceded by an extended memory write-back instruction under the following conditions:

First instruction:
2-operand instruction, extended mode using (register,index), (register,absolute), OR (register,symbolic) addressing modes

Second instruction:
2-operand instruction, extended mode using the (indirect,PC), (indirect auto-increment,PC), OR (indexed [with ind 0], PC) addressing modes

Example:
BISX.A  R6,&AABCD
ANDX.A  @R4+,PC

Workaround

1. Insert a NOP or a __no_operation() intrinsic function between the two instructions

Or

2. Do not use an extended memory instruction to modify the PC

Refer to the table below for compiler-specific fix implementation information.

IDE/Compiler Version Number Notes
IAR Embedded Workbench Not affected
TI MSP430 Compiler Tools (Code Composer Studio) v4.1.3 or later
MSP430 GNU Compiler (MSP430-GCC) Not affected