CIAPEM chip used in Brandt washer

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Does anyone have any working knowledge of how the CIAPEM microprocessor
logic work which was used in a Brandt BR1000 washer? At issue is the
line frequency. How is the chip used the line frequency as a
timed-based mechanism to control the timer motor? How does the chip
tell the difference whether it's being fed 50hz or 60hz?

Alternatively, since I have the part number, how might I be able to get
more info from the company since I couldn't find the company under
CIAPEM on the web?

Thanks in advance for any help.