One section of the STM32L431 manual (46.4 Pinout and debug port pins) says:
To avoid any uncontrolled I/O levels, the device embeds internal pull-ups and pull-downs on the JTAG input pins:
- JTMS/SWDIO: internal pull-up
In another section (46.8 debug port), it says:
For SWDIO bidirectional management, the line must be pulled-up on the board (100 kOhm recommended by ARM).
Are both of these statements correct? How can this be?