PROCESSOR, EMULATOR AND EXAMINING METHOD

摘要

PROBLEM TO BE SOLVED: To trace internal information without developing a processor for debugging by outputting trace data as analog data. SOLUTION: A processor 2 has a D/A converter 3 for inputting a signal to be traced. A trace control part 4 is composed of an A/D converter 5 for inputting the output of the D/A converter 3 from the processor 2, a trace memory 6 for writing the digital output of the A/D converter 5 and a timing control circuit 7 for controlling the trace memory. The D/A converter 3 performs D/A conversion synchronously with a timing control signal 9 and outputs the preceding D/A conversion result as an analog signal. The A/D converter 5 of the trace control part 4 similarly performs A/D conversion synchronously with the timing control signal 9 and outputs the result. The timing control circuit 7 writes trace data restored into digital data into the trace memory by generating a write signal to the trace memory 6 corresponding to the output of the A/D converter 5.