Hra calculation

Dear Freinds,

Please advice on below mentioned circumstances.

If A person working with more than 1 orgasination through out the year, and recd salary from both employer. however TDS is deducted by only 1 employer and person has not report his other salary income to main employer who issued FORM 16.

If same person received HRA from 1st employer than while calculating final Final HRA exemption, shall we considered salary recd from both employer or salary recd from employer who paid HRA?

Pls Reply Urgent

Thanks in Advance