module MyCounter (clock, preset, updown, presetdata, counter);
input clock, preset, updown;
input [1: 0] presetdata;
output reg [1:0] counter;

always @(posedge clock)
    if(preset)
	    counter <= presetdata;
	else
	    if(updown)
		    counter <= counter + 1;
		else
		    counter <= counter - 1;
endmodule