The method of probability cellular automaton (PCA) has been used to simulate turbulent stirring, molecular diffusion, and the reactions of the stochastic Oregonator in each cell of the automaton and to model the bifurcation of oscillation frequency multiplication discovered earlier in the Belousov-Zhabotinsky reaction in water-in-oil Aerosol OT microemulsion. At large constants of mass exchange between the adjacent PCA cells (k(ex)), the system demonstrates oscillations whose shape and period (T-infinity) are fully identical with those obtained from the solution of the ordinary differential equations. When k(ex) decreases, the period T shortens and reaches the limit T-m at k(ex) less than or equal to k(cr). The smaller the volume V-c assigned to a PCA cell and the slower the system's approach to the critical concentration of the inhibitor [Br-](cr), the higher the ratio T-infinity/T-m. The stochastisity of microoscillators in the source of new frequencies.