In large bowl, gently toss apples, pears, granulated sugar, 1/4 cup flour, the cinnamon and salt. Let stand 15 minutes. Place 1 pie crust in ungreased 9-inch deep-dish glass pie plate; sprinkle lightly with 1 tablespoon flour. Spoon apple mixture into pastry-lined pie plate; dot with 2 tablespoons butter. Sprinkle with 1/2 cup of the toffee bits. Top with second pie crust. Flute edges as desired. Cut slits in several places in top crust to allow steam to escape.