https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html indicates that it has "Arm® Cortex®-M4/M0+". I am confused about this: does it use an M4 or an M0+? Also, what is the difference between the WL55JC1 and WL55JC2 versions of the Nucleos?

[JGree.16]

Please disregard the first question as the answer seems to be that the WL has dual cores so it has both an M4 and an M0+.

[MM..1 · Accepted solution]

WL and WB is SOCs and one core M0 is for internal hw control. Your user is M4

[JGree.16]

Makes sense, @MM..1​. Thanks for the timely response.

[Tilen MAJERLE]

WB and WL product lines are both dual core with CM4 and CM0+. There is a slight difference between them:

• WB: CM4 for user application, CM0+ for RF stack only
• WL: CM4 or CM0+ are fully user accessible, both can be used for app or for RF stack.