Mexico's central bank governor, who consistently had argued against exchange controls, resigned late Wednesday after those measures were imposed and the country's private banks were nationalized this week.

Manuel Mancera Aguayo was replaced immediately by Carlos Tello Macias, director of the National Sugar Bank and a former planning and budget minister under President Jose Lopez Portillo.

And in Buenos Aires, Argentina's Central Bank director, Santiago Giloteaux, resigned last night, just hours before he and Argentina's top economic officers were set to fly to the International Monetary Fund meeting in Toronto.

Giloteaux apparently wanted to resign 10 days ago when the economy minister and former Central Bank president Domingo Cavallo resigned abruptly.

But he decided to leave his post now because new Central Bank President Julio Gonzalez del Solar decided to go ahead and form part of Argentina's official mission to the IMF meeting, which begins Monday in Toronto, bank officials said.

Yesterday, the president of Chile's central bank also announced his resignation. No replacement has yet been named for Miguel Kast.

Meanwhile in Bolivia, banks halted all trading in dollars yesterday as the Bolivian peso plunged to a record low, leaving it worth one-ninth its level of seven months ago.

The pesos-to-dollar exchange rate closed at 275, nine times what it was before the military government devalued the peso in February by a record 76 percent. Since then, the government instituted a floating exchange system that has sent the dollar soaring.

In La Paz, banks also were forced to close because of a work stoppage by employes protesting the arrests of two Central Bank officials implicated in a deal to sell tin to a fake company.

A spokesman for Bolivia's military government, meanwhile, announced it would adopt a series of measures in the next few days to confront the rising dollar rate.

Cochabamba, Bolivia's second most important city 150 miles southeast of La Paz, was paralyzed Wednesday by a 24-hour strike in protest of worsening economic conditions.