MCBSTR750: Recover STR75X with JTAG disabled

Information in this article applies to:

• MCBSTR750 Evaluation Boards

QUESTION

I cannot connect to the STR75x device on my board. Instead, I get messages like:

Couldn't stop ARM device

What can cause this on the STR750 STMicroelectronics Device?

ANSWER

The JTAG interface can be disabled by random CPU instructions or by the power-down mode of the device.  To correct this, enable the on-chip boot loader, allowing the STR75x device to execute a valid program.

Setting the following configuration pins enables the on-chip boot loader:

BOOT0 = 3.3V
BOOT1 = GND

MORE INFORMATION

• Refer to Keil MCBSTR750 in the ULINK User's Guide.
• Refer to Downloading to Flash in the MCBSTR750 User's Guide.

SEE ALSO

• ULINK: RESET BEHAVIOUR ON PHILIPS LPC2000 DEVICES
• ULINK: NXP/Philips LPC2000 Arm Device Does Not React
• ULINK: Recovering SAM7 devices
• ULINK: Recover STR71X when JTAG disabled

Last Reviewed: Monday, January 11, 2021