竖条显示
process(hcnt,vcnt)
begin
if hcnt>=143 and hcnt<=223 then GRB223 and hcnt<=303 then GRB303 and hcnt<=383 then GRB383 and hcnt<=463 then GRB463 and hcnt<=543 then GRB543 and hcnt<=623 then GRB623 and hcnt<=703 then GRB703 and hcnt<=783 then GRB<="111";
end if;
end process;