嗨Alexander，
我发现了同样的问题。有关几份文件的信息是矛盾的。我将EN和SCS连接到3V3（未隔离），并将SYN打开。我在STPM32V2原理图中使用了一个Si8621隔离器，连接到威廉希尔官方网站
的隔离部分和CPU。当空闲和UART被选中时，STPM32不起作用，也不会像应有的那样将TXD引脚驱动为高电平。
接下来的尝试是：
- 像在STPM32V2原理图中一样在TXD上添加一个上拉电阻
- 将SYN连接到3V3
你有任何更新吗？
以上来自于谷歌翻译
以下为原文
Hi Alexander,
I found the same issue. Information on several documents is contradictory. I tied EN and SCS to 3V3 (not isolated), and left SYN open. I used a Si8621 isolator like in STPM32V2 schematic, to connect to the isolated part of the circuit and the CPU. The STPM32 doesn't work, and also doesn't drive high the TXD pin as it should be, when idle and UART selected.
Next tries are:
- add a pull-up on TXD like in the STPM32V2 schematic
- tie SYN to 3V3
Do you have any update?
嗨Alexander，
我发现了同样的问题。有关几份文件的信息是矛盾的。我将EN和SCS连接到3V3（未隔离），并将SYN打开。我在STPM32V2原理图中使用了一个Si8621隔离器，连接到威廉希尔官方网站
的隔离部分和CPU。当空闲和UART被选中时，STPM32不起作用，也不会像应有的那样将TXD引脚驱动为高电平。
接下来的尝试是：
- 像在STPM32V2原理图中一样在TXD上添加一个上拉电阻
- 将SYN连接到3V3
你有任何更新吗？
以上来自于谷歌翻译
以下为原文
Hi Alexander,
I found the same issue. Information on several documents is contradictory. I tied EN and SCS to 3V3 (not isolated), and left SYN open. I used a Si8621 isolator like in STPM32V2 schematic, to connect to the isolated part of the circuit and the CPU. The STPM32 doesn't work, and also doesn't drive high the TXD pin as it should be, when idle and UART selected.
Next tries are:
- add a pull-up on TXD like in the STPM32V2 schematic
- tie SYN to 3V3
Do you have any update?
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