CC2640R2F: Watchdog bypass during ISP.

Laxman G

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640, TPS3828

Hi,

would like to know how to bypass the external watchdog reset to CC2640 during ISP software update and JTAG programming with TPS3828.

over 6 years ago

0 Eirik V over 6 years ago

TI__Guru 56590 points

Hello Laxman,

By default, the I/O driver (output) and input buffer (input) are disabled (tri-state mode) at power on or reset. I believe the device is reset before JTAG programming so it might be that the WDI pin of the TPS3828 interpret this as high impedance and therefore will disable the countdown, but it is not tested and I cannot guarantee it will work.

There are some other hints and suggestions in the datasheet and here:

http://www.ti.com/lit/an/slva145/slva145.pdf

https://www.ti.com/lit/ds/symlink/tps3828.pdf

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CC2640R2F: Watchdog bypass during ISP.