https://community.nxp.com/t5/MPC5xxx/MPC5744P/m-p/2379951#M28429 <P>Here's the English translation of your question: &gt; Why is it that when I modify certain register values of the MPC5744P through S32DS, only some of the embsys registers can be modified? When modifying certain RW register values, an error is reported: "Error: Error in ONCE status register during instruction execution."</P><P>为什么我通过S32DS去修改MOC5744P的某些寄存器的值也是只有部分的embsys registers寄存器能被修改。修改某些RW寄存器值时会报出Error : Error in ONCE status register during instruction execution？<BR />将上述一段话翻译为英文</P> Thu, 11 Jun 2026 08:22:37 GMT GENG 2026-06-11T08:22:37Z https://community.nxp.com/t5/MPC5xxx/MPC5744P/m-p/2379951#M28429 <P>Here's the English translation of your question: &gt; Why is it that when I modify certain register values of the MPC5744P through S32DS, only some of the embsys registers can be modified? When modifying certain RW register values, an error is reported: "Error: Error in ONCE status register during instruction execution."</P><P>为什么我通过S32DS去修改MOC5744P的某些寄存器的值也是只有部分的embsys registers寄存器能被修改。修改某些RW寄存器值时会报出Error : Error in ONCE status register during instruction execution？<BR />将上述一段话翻译为英文</P> Thu, 11 Jun 2026 08:22:37 GMT https://community.nxp.com/t5/MPC5xxx/MPC5744P/m-p/2379951#M28429 GENG 2026-06-11T08:22:37Z https://community.nxp.com/t5/MPC5xxx/MPC5744P/m-p/2380581#M28431 <P>Hello,</P> <P>Without knowing any details I will answer just generally:</P> <P>The error is NOT a register access error - It is a debug link failure triggered by your write<BR />And that happens because those specific registers:</P> <UL> <LI>cause reset</LI> <LI>are not accessible in current mode</LI> <LI>require unlock / clock / sequence</LI> <LI>or cannot be safely written via debugger</LI> </UL> <P>Best regards,</P> <P>Peter</P> Fri, 12 Jun 2026 06:53:56 GMT https://community.nxp.com/t5/MPC5xxx/MPC5744P/m-p/2380581#M28431 petervlna 2026-06-12T06:53:56Z