my project is used nrf51822 mcu, it contains SIM, when the mcu is reading SIM data, and at the same, I take out theSIM, and the 51822's pin which is link with SIM is can't control,the IO is unnormal.
the 51822's pin (sic?) which is link with SIM is can't control
Do you mean pins (plural)?
I can't control the 51822 P0.22's level
So pins P0.27 and P0.26 continue to work correctly?
hello，the P0.26 is data pin, the vcc control pin P0.22 is not work, and the data is also wrong. I don't know why the IO can't work correctly?
Well, think about it: you say this happens when you pull out the "SIM" (you still haven't confirmed exactly what that is).
It sounds like you are doing this when the system is "live"; ie, fully powered and active - yes?
So what steps have you taken to ensure that there are no nasty glitches or other transients when you do this ... ?
