Frequency of nse,bse stock price updates

#1
Hi,


My Doubts:
1. NSE/BSE updates their stock prices in a regular interval (say 2ms) or varying intervals based on stock price changes?

2. NSE/BSE follow each and every tick (.05) right? When the price falls from 19.00 to 18.85, it will travel through 18.95 and 18.90 right(in millisecond durations)?


Any information related to this is welcomed :)

Thanks,
Karthick.