BQ27200 EEPROM programming

Dear all,

I'm using the BQ27200 in a very small PCB.

I place a test point on PGM PIN in order to access EEPROM.

in the datasheet it is not well elaborated.

I want to create the 21V pulse from an external power supply, meaning, applying a pulse of 21V to the PGM and use BQ easy for 27200 software to apply EEPROM values.

1. is it possible?
2. what is the longest pulse I can apply? does it have to be 50mS, or can I apply it for a sec before programming?
3. how much time after applying the pulse can I write to EEPROM? datasheet doesn't clearly say?

I'm  obviously trying to use standard power supply to write to EPROM without extra circuitry or MCU firmware writing.

thanks for any assistance,

Ran Aloni