TPL5010: RSTN pin continue low while in Manual trigger mode

Part Number: TPL5010

Tool/software:

Hi, 

I am using TPL5010 ic in our project. I am facing an issue. 

This is related to firmware flash. I have fixed the wake pulse time is 500mSec but while flashing the firmware in microcontroller, IC is getting reset. I read that if we put the controller in manual trigger then TPL will not send reset pulse. 

for manual trigger, I am keeping DELAY/M_RST pin high with VDD. As I keep high RSTn pin remains low. As i release high, RSTn pin again start to toggle with reset signal. 

How to keep RSTn pin high till firmware flash?