counter24.v

数字钟 可实现正常计数校准 还有方电台报时功能 四低一高 闹钟功能

module counter24 (CntH,CntL,nCR,EN,CP);
	input CP,nCR,EN;
	output [3:0] CntH,CntL;
	reg [3:0] CntH,CntL;
	reg CO;
	always@(posedge CP or negedge nCR)
	begin
		if(~nCR){CntH,CntL}<=8'h00;
		else if (~EN){CntH,CntL}<={CntH,CntL};
		else if (CntH>2||CntL>9||((CntH==2)&&(CntL>=3)))
				{CntH,CntL}<=8'h00;
		else if ((CntH==2)&&(CntL<3))
			begin CntH<=CntH;CntL<=CntL+1'b1;end

		else if (CntL==9)
			begin CntH<=CntH+1'b1;CntL<=4'b0000;end
		else 
			begin CntH<=CntH;CntL<=CntL+1'b1;end
end
endmodule