標題: 實現單片機步進電機功能第一個模塊，大家幫忙看看還缺什么改進一下 [打印本頁] 作者: jdjdje 時間: 2018-6-22 18:50 標題: 實現單片機步進電機功能第一個模塊，大家幫忙看看還缺什么改進一下 ibrary ieee
use ieee. std_logic-1164. All
use ieee. std_logic-arith all
use ieee. std logic-uns igned. All
entity freq is
port(clk-sys : in std_logic
clk_new : out std_logic)
end freq
circhitecture one of freq is
signal set : std_logic
signal cnt : std_logic-vector ( 17 downto O )begin
process ( clk_sys)
begin
if set ='1'then
cnt ="011111111111111111"
'elsif clk-sys'event and clk_sys = '1'then
Cnt = cnt-1
end if
end process
set« = cnt( 17)
clk new = cnt ( 16)
end one