The central government sticks to its stance of not talking to those wanting to break up the country.
Catalonia is the country's richest region and home to thousands of domestic and foreign companies.
Judges "ordered the suspension of the plenary that has been called for Monday in the [Catalan] parliament" while it hears an appeal lodged against it, a spokeswoman said, as the court confirmed the ruling in a written statement.
If triggered, article 155 can allow the Spanish government to take control of the regional government in Catalonia for failing to carry out its constitutional obligations.
Turkey, which condemned last week's referendum for Kurdish independence in northern Iraq, also spoke of the importance of respecting Spanish law and territorial integrity. Our obligation is to resolve problems and we'll do it, even though using certain measures might hurt.
Spain, which declared Sunday's referendum illegal and invalid, is bitterly opposed to any independence move.
The Madrid government has been taking a hard line against those who pushed the referendum, but current Catalan leader Carles Puigdemont has said he does not fear being arrested over his involvement, as Mr Mas was. Turnout, however, was well below 50 percent.
Dinesh Chandimal century boosts Sri Lanka against Pakistan
Ali was dismissed after scoring 85 runs today, followed by skipper Sarfraz Ahmed on 18 and bowler Mohammad Amir on four runs. He mentioned that the wicket of Azhar Ali was the turning point in the match.
Catalan leaders "with their irresponsible conduct could put at risk the economic and social stability of Catalonia and all of Spain", he said.
Rajoy has ruled out worldwide mediation as a format for resolving the future of Catalonia, offering instead all-party Spanish political talks to find a solution, on the condition independence is taken off the table.
Spain's Constitutional Court justified the ban by calling the move to declare independence "a breach of the constitution", as have other Spanish government officials including King Felipe VI.
In a televised address on Wednesday night, Puigdemont said: "This moment calls for mediation".
He also accused the national government of failing to respond to proposals for mediation in the crisis.
Barcelona Football Club and its captain Andres Iniesta also urged dialogue as a solution.
"If the Catalonia referendum goes ahead, we expect this to be a disruptive event for the euro, with the potential for a sharp decline of up to 5% initially in the single currency if the separatists win", Kathleen Brooks, research director at City Index, told the Daily Express last week. Yes, though it would require Spanish institutions acknowledging and addressing the root causes of the years of discontent that preceded this referendum. If Catalonia is to remain a part of Spain, a modern legal framework must be drafted in that same spirit - to work for the people, not against them.