Microchip datasheet for the PIC16C745 and PIC16C765, PIC16 microcontrollers with an integrated low-speed USB interface, supplied as a 4.83 MB PDF. It documents the USB module, pin assignments, oscillator requirements, ADC and other peripherals plus electrical characteristics. Useful for tracing the D+ and D- lines, checking the USB supply pin and crystal, and confirming the part on older USB peripherals. These are OTP or EPROM devices, so a defective controller usually needs replacing with a chip carrying the original program.
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