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This is my gps display for the car- currently it uses a 16F628 running at 12MHz
Click here for the track layout, here for the component overlay,
here for the hex file for a 12 Mhz crystal and here for the hex file for a 10 Mhz crystal
The board is designed to solder directly to the connector on the rear of the display, but it is no problem to connect via a short cable if required. The contrast pot can be board-mounted or front panel, whatever suits, value is not critical, anywhere betwen 1 and 50k.
The board accepts standard NMEA data at 4800 baud, 8 bits, and no parity, so most gps's with a NMEA data output should drive it. The only problem would be if the data is inverted, in which case a simple single transistor inverter will cure the problem.
Handbook_of_Time_Code_Formats.pdf
Fundamentals of Time and Frequency.pdf
Introduction to time and frequency metrology.pdf
Residual PM Noise Evaluation of Radio Frequency Mixers.pdf
Oncore MAX232 bottom layer.pdf
Oncore MAX232 parts layout.pdf
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