SLAZ337AA December   2012  – September 2021 MSP430F6659

 

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6.11 CPU47

CPU Module

Category

Functional

Function

An unexpected Vacant Memory Access Flag (VMAIFG) can be triggered

Description

An unexpected Vacant Memory Access Flag (VMAIFG) can be triggered, if a PC-modifying instruction (e.g. - ret, push, call, pop, jmp, br) is fetched from the last addresses (last 4 or 8 byte) of a memory (e.g.- FLASH, RAM, FRAM) that is not contiguous to a higher, valid section on the memory map.
In debug mode using breakpoints the last 8 bytes are affected.
In free running mode the last 4 bytes are affected.

Workaround

Edit the linker command file to make the last 4 or 8 bytes of affected memory sections unavailable, to avoid PC-modifying instructions on these locations.
Remaining instructions or data can still be stored on these locations.