AnsweredAssumed Answered

ST-LINK V2 Can not connect to target! Help Me!!

Question asked by gyosun on Aug 22, 2016
Latest reply on Aug 22, 2016 by Clive One
Hi All,

Connect the pins were as follows: SWD ST-LINK V2 and between MCU.
1:VDD - VDD
3:GND - GND
7:SWDIO - PA13_SWDIO 
9:SWCLK - PA14_SWCLK

PDR_ON: 10k pull-up
BOOT0: 10k pull-down
BYPASS_REG: 10k pull-down
VCAP: 2.2uF GND
VDD:1.8V
VDDUSB:1.8V
VBAT:1.8V
VDDA:1.8V

The test MCU is in STM32F746NGH6.
VDD is 3.3V when the connection was good, do not connect change with VDD 1.8V, as shown below.
On the MCU specifications are listed as available from 1.7V to 3.6V.

Can not connect to target!
Please select "Connect Under Reset" mode from Target->Settings menu and try again.
If you're trying to connect to a low frequency application , please select a lower SWD Frequency mode from Target->Settings menu.

What's the problem?

Thank you.
Best regards,

gyosun.

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