  V,R,I continuum bands and Halpha + [NII] photometry for circumnuclear star
forming regions (CNSFR) is presented, for galaxies with different kinds of
nuclear activity: NGC 7469 (Sy 1), NGC 1068 (Sy 2), NGC 7177 (LINER) and NGC
3310 (Starburst). Their Halpha luminosities (0.02 - 7x10**40 erg/s; uncorrected
for internal extinction), are comparable to those observed in other galaxies.
No systematic differences in the broad band colours are found for the CNSFR in
the different galaxies, except for those in NGC 3310 which are considerably
bluer, partially due to a younger stellar population. Using theoretical
evolutionary synthesis models some colours can be reproduced by single
populations (between 7 and 300 Myr) and extinction 0.5-1.5 mag). However, in
many cases, the observed equivalent width of Halpha, require a younger
population. NGC 1068, 7177 and 7469, are fitted by a two-burst population model
at solar metallicity; the age difference between both populations is around 5-7
Myr and the younger burst involves 3 - 61% of the total mass of the
cluster,consistent with the younger burst being originated by supernova
activity from the previous one. NGC 3310, requires younger ionizing population
ages and lower metallicity. An excess (R-I) observed/predicted, not consistent
with a normal reddening law can be atributted to red supergiants present in the
older population, and not properly accounted for by the models. The
two-population scenario seems to show a trend of the evolutionary state of the
CNSFR with the nuclear type of the parent galaxy that remains to be explored.
