MC_ME_IS.I_MTC停留在0

大家好，

我正在尝试使用SPC5 Studio上的样本SPC570S发现代码的修改版本从SPC570S40E1 mcu生成时钟输出。我有一个16 MHz外部晶体连接到mcu。

选择适当的MC_CGM和MC_ME.RUN_PCn设置后，我的代码卡在__early_init，当尝试再次切换到DRUN以更新设置时。 MC_ME.IS.I_MTC永远不会切换为1。

ME_GS.S_MTRANS切换为1.但是，仅仅为了错误跟踪，我试图切换到RUN0而不是DRUN（当S_CURRENT_MODE处于DRUN时）并且即使S_MTRANS切换为1，S_CURRENT_MODE仍然保持在0x3（DRUN） 。 ME_MCTL.TARGET_MODE切换为0x4（RUN0）。

经过一些修补，我注意到我的时钟信号可能不合适;它的峰峰值介于40mV和1.12 V之间，据我在数据手册中所了解，我的时钟信号需要至少1.5 V的峰值峰值。

然而，即使我已经将CGM_AC0_SS，CGM_AC2_SS和CGM_SC_SS切换到0x0（16 MHz内部时钟），我仍然停留在同一步骤。

为什么即使我使用内部时钟，MC_ME.IS.I_MTC在尝试第二次切换到DRUN时仍会卡在0？

提前致谢。



以下为原文

Hi all,

I am trying to generate a clock output from an SPC570S40E1 mcu using modified version of the sample SPC570S discovery codes on SPC5 Studio. I have a 16 MHz external crystal connected to the mcu.

After selecting appropriate MC_CGM and MC_ME.RUN_PCn settings, my code is stuck at __early_init, when trying to switch again to DRUN to update the settings. The MC_ME.IS.I_MTC is never toggled to 1.

ME_GS.S_MTRANS is toggled to 1. However, just for the sake of error tracing, I tried to switch to RUN0 instead of DRUN (when S_CURRENT_MODE is at DRUN) and even though S_MTRANS is toggled to 1, S_CURRENT_MODE stays at 0x3 (DRUN). ME_MCTL.TARGET_MODE is toggled to 0x4 (RUN0).

After some tinkering around, I have noticed that my clock signal might not be appropriate; it is between 40mV and 1.12 V peak to peak and as far as I've understood from the data sheet, I'd need at least 1.5 V max peaks on my clock signal.

However, even though I have switched CGM_AC0_SS, CGM_AC2_SS and CGM_SC_SS to 0x0 (16 MHz internal clock) I am still stuck at the same step.

Why would the MC_ME.IS.I_MTC be stuck at 0 while trying to switch to DRUN a second time even though I am using the internal clock?

Thanks in advance.