用 Verilog HDL 代码或原理图设计一个电子时钟
时间: 2024-03-11 17:46:58 浏览: 15
以下是一个使用 Verilog HDL 代码设计的电子时钟的例子。这个例子使用了基本的计数器和分频器来生成时钟信号,同时使用了时序逻辑来控制显示的数字。
```verilog
module clock(
input clk,
output reg [3:0] seg_a,
output reg [3:0] seg_b,
output reg [3:0] seg_c,
output reg [3:0] seg_d,
output reg dp
);
reg [3:0] counter_sec = 4'b0000; // 秒计数器
reg [3:0] counter_min = 4'b0000; // 分钟计数器
reg [3:0] counter_hour = 4'b0000; // 小时计数器
reg [1:0] div_sec = 2'b00; // 秒分频器
reg [1:0] div_min = 2'b00; // 分钟分频器
// 时钟分频器
always @(posedge clk) begin
if (div_sec == 2'b00) begin
// 每秒钟计数器加1
if (counter_sec == 4'b1001) begin
counter_sec <= 4'b0000;
if (div_min == 2'b00) begin
// 每分钟计数器加1
if (counter_min == 4'b1001) begin
counter_min <= 4'b0000;
// 每小时计数器加1
if (counter_hour == 4'b1001) begin
counter_hour <= 4'b0000;
end else begin
counter_hour <= counter_hour + 1;
end
end else begin
counter_min <= counter_min + 1;
end
end
end else begin
counter_sec <= counter_sec + 1;
end
end
// 秒分频器
if (div_sec == 2'b01) begin
div_sec <= 2'b00;
end else begin
div_sec <= div_sec + 1;
end
// 分钟分频器
if (div_min == 2'b11) begin
div_min <= 2'b00;
end else begin
div_min <= div_min + 1;
end
end
// 数码管控制
always @(posedge clk) begin
case(counter_sec)
4'b0000: begin
seg_a <= 4'b011111;
seg_b <= 4'b000001;
seg_c <= 4'b011111;
seg_d <= 4'b011111;
end
4'b0001: begin
seg_a <= 4'b000001;
seg_b <= 4'b000001;
seg_c <= 4'b000001;
seg_d <= 4'b000001;
end
4'b0010: begin
seg_a <= 4'b010111;
seg_b <= 4'b010001;
seg_c <= 4'b001010;
seg_d <= 4'b011111;
end
4'b0011: begin
seg_a <= 4'b010011;
seg_b <= 4'b010001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
4'b0100: begin
seg_a <= 4'b001001;
seg_b <= 4'b011001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
4'b0101: begin
seg_a <= 4'b011010;
seg_b <= 4'b011001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
4'b0110: begin
seg_a <= 4'b011110;
seg_b <= 4'b010001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
4'b0111: begin
seg_a <= 4'b000011;
seg_b <= 4'b000001;
seg_c <= 4'b011111;
seg_d <= 4'b011111;
end
4'b1000: begin
seg_a <= 4'b011111;
seg_b <= 4'b011001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
4'b1001: begin
seg_a <= 4'b011011;
seg_b <= 4'b011001;
seg_c <= 4'b010011;
seg_d <= 4'b011111;
end
default: begin
seg_a <= 4'b000000;
seg_b <= 4'b000000;
seg_c <= 4'b000000;
seg_d <= 4'b000000;
end
end
// 小时数码管控制
case(counter_hour)
4'b0000: begin
seg_a[3] <= 1'b1;
end
4'b0001: begin
seg_b[3] <= 1'b1;
end
4'b0010: begin
seg_c[3] <= 1'b1;
end
4'b0011: begin
seg_d[3] <= 1'b1;
end
4'b0100: begin
seg_a[2] <= 1'b1;
end
4'b0101: begin
seg_b[2] <= 1'b1;
end
4'b0110: begin
seg_c[2] <= 1'b1;
end
4'b0111: begin
seg_d[2] <= 1'b1;
end
4'b1000: begin
seg_a[1] <= 1'b1;
end
4'b1001: begin
seg_b[1] <= 1'b1;
end
default: begin
seg_c[1] <= 1'b1;
end
end
// 分钟数码管控制
case(counter_min)
4'b0000: begin
seg_a[7] <= 1'b1;
end
4'b0001: begin
seg_b[7] <= 1'b1;
end
4'b0010: begin
seg_c[7] <= 1'b1;
end
4'b0011: begin
seg_d[7] <= 1'b1;
end
4'b0100: begin
seg_a[6] <= 1'b1;
end
4'b0101: begin
seg_b[6] <= 1'b1;
dp <= 1'b1; // 显示小数点
end
4'b0110: begin
seg_c[6] <= 1'b1;
end
4'b0111: begin
seg_d[6] <= 1'b1;
end
4'b1000: begin
seg_a[5] <= 1'b1;
end
4'b1001: begin
seg_b[5] <= 1'b1;
end
default: begin
seg_c[5] <= 1'b1;
end
end
end
endmodule
```
这个例子使用了4个共阳数码管来显示时间,使用了3个计数器来计时,并使用了2个分频器来控制秒钟和分钟计数器的计数速度。时钟信号从外部输入,可以使用晶振或其他时钟源来提供时钟信号。