带有复位开关,开始与暂停的计时秒表vhdl
时间: 2023-08-11 16:04:07 浏览: 88
以下是一个带有复位开关,开始和暂停功能的计时秒表的VHDL代码:
```vhdl
entity stopwatch is
Port ( clk : in STD_LOGIC;
reset : in STD_LOGIC;
start_pause : in STD_LOGIC;
seconds : out STD_LOGIC_VECTOR (23 downto 0));
end stopwatch;
architecture Behavioral of stopwatch is
signal count : integer range 0 to 24000000 := 0; -- 24 MHz clock frequency
signal running : boolean := false;
begin
process(clk, reset, start_pause)
begin
if reset = '1' then -- Reset
count <= 0;
running <= false;
elsif start_pause = '1' and running = false then -- Start
running <= true;
elsif start_pause = '1' and running = true then -- Pause
running <= false;
elsif rising_edge(clk) and running = true then -- Count while running
count <= count + 1;
end if;
end process;
seconds <= std_logic_vector(to_unsigned(count/24000000, 24)); -- Convert count to seconds
end Behavioral;
```
该代码使用一个名为“count”的信号来计算经过的时钟周期数,并将其转换为秒并输出到名为“seconds”的输出端口。
通过使用名为“reset”的输入端口,可以将计数器复位为零。名为“start_pause”的输入端口允许您开始和暂停计时器。如果该输入端口为高电平并且计时器当前处于停止状态,则计时器将开始计数。如果该输入端口为高电平并且计时器当前正在运行,则计时器将暂停。