SLAZ279AA October   2012  – May 2021 MSP430F5418

 

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6.18 CPU27

CPU Module

Category

Compiler-Fixed

Function

Program Counter (PC) is corrupted during the context save of a nested interrupt

Description

When a low power mode is entered within an interrupt service routine that has enabled nested interrupts (by setting the GIE bit), and the instruction that sets the low power mode is directly followed by a RETI instruction, an incorrect value of PC + 2 is pushed to the stack during the context save. Hence, the RETI instruction is not executed on return from the nested interrupt and the PC becomes corrupted.

Workaround

Insert a NOP or __no_operation() intrinsic function between the instruction that sets the lower power mode and the RETI instruction.  

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

IDE/Compiler Version Number Notes
IAR Embedded Workbench IAR EW430 v6.20 until v6.40 User is required to add the compiler or assembler flag option below. --hw_workaround=nop_after_lpm
IAR Embedded Workbench IAR EW430 v6.40 or later Workaround is automatically enabled
TI MSP430 Compiler Tools (Code Composer Studio) v4.1.3 or later
MSP430 GNU Compiler (MSP430-GCC) MSP430-GCC 4.9 build 167