SLAZ597V January 2014 – May 2021 MSP430F6779A
CPU Module
Compiler-Fixed
PC is corrupted when executing jump/conditional jump instruction that is followed by instruction with PC as destination register or a data section
If the value at the memory location immediately following a jump/conditional jump instruction is 0X40h or 0X50h (where X = don't care), which could either be an instruction opcode (for instructions like RRCM, RRAM, RLAM, RRUM) with PC as destination register or a data section (const data in flash memory or data variable in
RAM), then the PC value is auto-incremented by 2 after the jump instruction is executed; therefore, branching to a wrong address location in code and leading to wrong program execution.
For example, a conditional jump instruction followed by data section (0140h).
@0x8012 Loop DEC.W R6
@0x8014 DEC.W R7
@0x8016 JNZ Loop
@0x8018 Value1 DW 0140h
In assembly, insert a NOP between the jump/conditional jump instruction and program code with instruction that contains PC as destination register or the data section.
Refer to the table below for compiler-specific fix implementation information.
| IDE/Compiler | Version Number | Notes |
|---|---|---|
| IAR Embedded Workbench | IAR EW430 v5.51 or later | For the command line version add the following information Compiler: --hw_workaround=CPU40 Assembler:-v1 |
| TI MSP430 Compiler Tools (Code Composer Studio) | v4.0.x or later | User is required to add the compiler or assembler flag option below. --silicon_errata=CPU40 |
| MSP430 GNU Compiler (MSP430-GCC) | Not affected |