module count60(qout,cout,data,load,cin,reset,clk);
output[7:0] qout;
output cout;
input[7:0] data;
input load,cin,clk,reset;
reg[7:0] qout;
always @(posedge clk) //clk 上升沿时刻计数
begin
if (reset) qout<=0; //同步复位
else if(load) qout<=data; //同步置数
else if(cin)
begin
if(qout[3:0]==9) //低位是否为9,是则
begin
qout[3:0]<=0; //回0,并判断高位是否为5
if (qout[7:4]==5) qout[7:4]<=0;
else
qout[7:4]<=qout[7:4]+1; //高位不为5,则加1
end
else //低位不为9,则加1
qout[3:0]<=qout[3:0]+1;
end
end
assign cout=((qout==8'h59)&cin)?1:0; //产生进位输出信号
endmodule