SLAZ611AA August   2014  – August 2021 MSP430FR5986

 

  1.   1
  2.   2
  3.   3
  4.   4
  5.   5
    1.     6
    2.     7
      1.      8
    3.     9
  6.   10
    1.     11
    2.     12
    3.     13
    4.     14
    5.     15
    6.     16
    7.     17
    8.     18
    9.     19
    10.     20
    11.     21
    12.     22
    13.     23
    14.     24
    15.     25
    16.     26
    17.     27
    18.     28
    19.     29
    20.     30
    21.     31
    22.     32
    23.     33
    24.     34
    25.     35
    26.     36
    27.     37
    28.     38
    29.     39
    30.     40
    31.     41
    32.     42
    33.     43
    34.     44
    35.     45
    36.     46
    37.     47
    38.     48
    39.     49
    40.     50
    41.     51
    42.     52
    43.     53
    44.     54
    45.     55
    46.     56
    47.     57
  7.   58

6.14 CPU40

CPU Module

Category

Compiler-Fixed

Function

PC is corrupted when executing jump/conditional jump instruction that is followed by instruction with PC as destination register or a data section

Description

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

Workaround

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