Best approach for creating clock sources please?

The clock source is constant and a 'true' clock.

  proc_Counters : PROCESS(IN_RESETn, M24MHz)
  BEGIN
    IF IN_RESETn='0' THEN
      usg_Counter_7_0 <= (OTHERS => '0');
    
    ELSIF RISING_EDGE(M24MHz) THEN
      IF en_uM8MHz ='1' THEN
        IF usg_Counter_7_0 = usg_MAXCOUNT THEN
          --Reset the counter...
          usg_Counter_7_0 <= (OTHERS => '0');
        ELSE
          --... or increment the counter
          usg_Counter_7_0 <= usg_Counter_7_0 + 1;
        END IF;
      END IF;
    END IF;
  END PROCESS proc_Counters;