SLAZ196I October 2012 – May 2021 MSP430F423
6.9 MPY2
MPY Module
Category
Functional
Function
Multiplier Result register corruption
Description
Depending on the address of the write instruction, writing to the multiplier result registers (RESHI, RESLO, or SUMEXT) may corrupt the result registers. The address dependency varies between a 2-word and a 3-word instructions.
Workaround
Ensure that a write instruction to an MPY result register (for example, mov.w #200, &RESHI) is not located at an address with the four least significant bits shown in Table 1:
Table 1. Sensitive Addresses for Write Access to MPY Result Registers MAB[3:0]
