能不能帮我解释一下这串代码怎么实现八分频的吗？

module divx(clkin,rst,bin,ledout
);
input clkin,rst;
input [3:0]bin;
output reg [1:0] ledout;
reg clkout;
reg [31:0] cnt_1s;
reg [3:0] cnt;
reg [3:0] tp;

 always @ (posedge clkin or posedge rst)
    if(rst==1)//由于按键是按下为高电平，不按下时为低电平，所以当按下时触发清零信号
    cnt_1s<=0;
    else if(cnt_1s==99999999)
    cnt_1s<=0;
    else
    cnt_1s<=cnt_1s+1;


 always @ (posedge clkin or posedge rst)
    if(rst==1)
    begin
    clkout<=0;
    ledout[0]<=0;
    end
    else if(cnt_1s<=49999999)
    begin
    clkout<=0;
    ledout[0]<=0;
    end
    else
    begin
    clkout<=1;
    ledout[0]<=1;
    end



always @ (posedge clkin or posedge rst)
    if(rst==1)
        ledout[1]<=0;

    else if(bin>1)
        begin
            if(cnt==8)
                ledout[1]<=1;
            else 
                ledout[1]<=0;
        end
    else if(bin==1)
        ledout[1]<=clkout;
    else if(bin==0)
        ledout[1]<=1;





always @ (posedge clkout or posedge rst)
    if(rst==1)
        cnt<=(8-tp+1);
    else if(cnt==8)
        cnt<=(8-tp+1);
    else
        cnt<=cnt+1;


always @(posedge clkin or posedge rst)
    begin
        case(bin)
            4'b0001: tp<=4'b0001;
            4'b0010: tp<=4'b0010;
            4'b0011: tp<=4'b0011;
            4'b0100: tp<=4'b0100;
            4'b0101: tp<=4'b0101;
            4'b0110: tp<=4'b0110;
            4'b0111: tp<=4'b0111; 
            4'b1000: tp<=4'b1000;
            default: tp<=4'b1000;
        endcase
    end

endmodule