how to create low freq clock ?

should the code look like this then for a low frequency "clock" ?

module listen(clk, reset, start, data_in, data_out, data_valid, data_count);
input clk;
input reset;
input start;
input  data_in; // from ADC @ 100 Mhz
output  data_out; 
output data_valid;
output addr;
reg  data_out;
reg data_valid;
reg data_count;
///////////////////////////////////////////////////////////////////
// start of listener
// ADC runs at 100 mhz
// 100 Mhz domain assumed
// signal is downsampled :one in every 256 samples is processed
// LPF filtering not posible : will not fit chip
// todo : make smaller LPF filter
// busy goes high as soon as start is received
// see data_count for de-asserting busy signal
always @(posedge clk) 
    if (~busy) busy <= start;
// get and LPF the datastream 
// sample rate is 100 Mhz, 
// filter is designed with -3db point at 500 khz
// signal is between 10 and 100 khz 
// decimation by 200 ; next steps need 500 khz clock
// beware time-delay !!
// 
// no space on chip for this
//
//ownfir myLPFfir(.Clk(clk),
//   .dataIn(data_flash_reg),
//    .dataOut(data_flash_reg1)
//    );
// create slow signal for slow sampling
reg  clockdivider;
always @(posedge clk) clockdivider <= clockdivider + 8'd1;
// creates a 1-clk pulse every 256 clk pulses
reg slowtick
always @(posedge clk) slowclk <= (clockdivider == 8'b00000000) ; // divides by 256; should give 390625/sec ticks on 100Mhz clock
      
// decimation       
// select sample when slowtick is asserted 
// do this also when not busy to keep feeding the filter
reg signed  data_flash_reg;
always @(posedge clk)
   if (slowtick) data_flash_reg <= $signed(data_in - 8'd128);
    
// do matched filtering 
// this answers over the previous 76 slowticks
// for 76 taps, that is    
ownmatch mymatch(.Clk(clk),.slow(slowtick),
    .dataIn(data_flash_reg),
     .dataOut(data_flash_reg2)
     );
     
// back to unsigned, 
// report unsigned to the outside world    
always @(posedge clk) 
      if (slowtick && busy) 
       begin 
         data_out <= $unsigned(data_flash_reg2 + 8'sd127 + 8'sd1);    
          data_valid <= 1'b1;
        end 
        else data_valid <= 1'b0;
        
// process for address generation
// reg  data_count;
// disregard the first 76 samples !!
// todo : manage data_count/ data_valid to compensate for this lag
//
always @(posedge clk) 
if (slowtick && busy) 
  data_count <= data_count + 12'd1;
else
  if (~busy) data_count <= 12'd0;  
  
// done when address space has been filled
always @(posedge clk)
  if (slowtick && data_count == 12'b111111111111) busy <= 1'd0;
endmodule