Integrated circuit monitoring an internal signal converted from an analog input signal

An integrated circuit comprising:

• a signal processor, which receives an input signal and generates a processed signal and at least one type of internal signal, the processed signal representing processing information obtained by subjecting the input signal to predetermined processing, the internal signal including internal information obtained while the processor is performing the processing;
• at least one memory to store the processing information represented by the processed signal;
• an interface for exchanging signals with an external device;
• and
• a controller for controlling the signal processor, the memory and the interface,
• wherein on receiving a first instruction from the external device by way of the interface, the controller controls the signal processor and the memory such that the processing information, represented by the processed signal being output from the signal processor, is once stored in the memory and then output to the external device via the interface,
• wherein on receiving a second instruction from the external device by way of the interface, the controller controls the signal processor and the memory such that the internal information, represented by the internal signal being generated by the signal processor, is once stored in the memory and then output to the external device via the interface, and
• wherein the signal processor includes an analog-to-digital converter, a Viterbi decoder, a PLL, and a demodulator, and
• wherein the input signal is an analog signal, and the internal signal is generated based on a signal converted from the input signal by the analog-to-digital converter and includes a phase error signal, a frequency error signal, a multi-bit sampling level signal, and a digital signal.