The resistor closest to this chat thread, based on the given schematic position (-125, 57), is R2. The value of R2, as per its part name (RMCF0805JT47K0), is 47kΩ.

The component closest to this chat thread's schematic position (5, 222) is C1, which is a 10pF 0603 Capacitor. Therefore, the value of "C" is 10pF (picofarads).

The "XTA" refers to the external clock input for a device. In this case, it seems you're asking for the clock frequency that should be provided to a part. However, you didn't specify which part in your question.

If you're referring to the ESP8266-12E/ESP-12E (U1), the ESP8266 doesn't have a specific "XTA" pin. However, it does have a clock input via the SCLK pin, which is used for SPI communication. The clock speed for SPI on the ESP8266 can be up to 80 MHz.

If you're referring to the CH340G (IC1), it has an XI pin and an XO pin, which are typically connected to an external crystal oscillator. The CH340G typically uses a 12 MHz crystal.

Please specify the component you're asking about so I can provide a more accurate answer.