Hi, I'm bring up a new board with an MK20DX128VLH7 2N36B
The reset line RESET_b/pin34 is continuously asserting for 50uS, releasing ~2us, and then asserting.
I have a
R=10K toV3v on EZP_CS/NMI_b/PTA4 pin 26
R=100K to V3v SWD_DIO /Pta3 pin 25
I've verified the Power - Vout33 goes to VddA/VRefH/0.1uF, then 47nH to Vbat/Vdd with 0.1uF on each pin - noise on all pwr sply appears less than 5mV
No funny/50uS signals on any other pin.
If I force the EZP-CS low - then it doesn't continuously reset, I guess having entered the EZPort boot.
Should I be forcing any other pins to a known state to prevent it reseting?
Any insights appreciated.
Once it stops resetting I have a Segger JLink to program it, however currently the JLink can't access it.