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TMS320F28062F: watchdog cannot reset when stand along from flash

Samsai
Intellectual 825 points

Part Number: TMS320F28062F

Dear all,

We are using WDOG in F28062F, we want WDOG to reset the device after stop serving the dog. Here is what I see:

1. Everything is OK if we debug use JTAG, the device reset and the code restart.

2. But when we power off and on, and let the device run from flash standalone, the WDOG cannot reset the device, we output the register to the UART and found the SCSR.bit.WDOVERRIDE is cleared to 0 after POR, so the WDOG cannot enable, but we don't modified WDOVERRIDE anywhere in the code, so we think it should be clear in BOOT ROM code? What 's the different of WDOG when debug and offline free run?

3. After power cycle and the WDOG is already disabled by WDOVERRIDE, if we toggle the reset pin and reset the device, everything will be good and the device will reset periodic. Seems a warm reset will set the WDOVERRIDE bit to 1 and release the WDOG, but when and how could the WDOVERRIDE be cleared?

Thanks a lot.

BR,

Sam