Simple logic analyzer pushes microcontroller to its limit

Posted on Jan 24, 2013

A simple logic-analyzer design is compatible with all versions of Windows and pushes the PIC 18C252 chip to its speed limit to achieve a 1-MHz sampling rate (Figure 1). The circuit can examine three channels of relatively low-speed logic signals that have infrequent, or sparse, transitions. The analyzer can record only 510 transitions per run, but a run can last as long as several minutes, if necessary. Applications include monitoring the I/O of an IBM keyboard or printer port, TI-calculator intercommunication, and serial (RS-232) signals.

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