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The maximum operating frequency of P89CV51RD2FBC,557 is 48 MHz.
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Yes, P89CV51RD2FBC,557 is compatible with 5V power supply, but it can also operate at 3V with reduced frequency.
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The programming interface for P89CV51RD2FBC,557 is ISP (In-System Programming) using a serial interface.
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Yes, P89CV51RD2FBC,557 has three built-in UARTs (Universal Asynchronous Receiver-Transmitters).
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The maximum amount of flash memory available on P89CV51RD2FBC,557 is 64 KB.