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How To Hook Up A Microcontroller To The Interface Chip

Your microcontroller if you are using one can communicate with the Interface Chip over 3 wires. Pin 7 on the Interface Chip is the input for the data bit. When the pin is low it is a zero data bit. When the pin is high it is a one data bit. Your microcontroller must output the data bit before the clock pulse. The data bit must be at least 40 us long.

Pin 33 on the Interface Chip is the input for the clock bit. Your microcontroller must output a high pulse for at least .5 us.

Pin 5 on the Interface Chip is an output pin. When this pin goes high it is to let your microcontroller know that it is ready to receive the next command. This pin will go low if the Interface Chip is getting a signal from the "VEX" transmitter. This pin will also go low and stay low if there was a communication error between your microcontroller and the Interface Chip.

Pin 4 is an output pin. If there is a communication error between the Interface Chip and your microcontroller, this pin will go high and stay high . A reset must be done in order to clear this error.