Open Question: As long as you have sufficient cash in your account, can you keep your written call?

What if I sell one call for 1 dollar at a 17 dollar strike price. I sell the call when the stock xyz is ten dollars. The stock rises to 10.75, my call I'm selling has gone against me and is now worth 1.50. I am now down 50 percent, would my brokerage force me to close my call? But the call is under the strike price. Let's say I have 5000 dollars in my account that I'm not using but I'm down 50 percent, 50 dollars on that one call.