True Gray Code Counter Based on Binary Counter and Its Application to Computer Measurement for Multi-channel Time-sequence

The combination of binary counter and XOR gate is equal to a pseudo Gray code counter.The true Gray code counter can be done by binary counter driving T'-type flip-flop (T'-ff).By the structure of Gray code counter adding multi flip-latch with CPLD, the computer measurement for multi-channel time-sequence is implemented easily.The circuit was successful in applying in delay time measurement for control program.