Description: System to set up a two BCD code countdown counter (count pulse 1HZ), used to record the duration of each state because the duration of each state are inconsistent, so these counters should be placed in several different presets countdown of numerical output to two digital display procedures were set up four processes: ① process P1, P2 and P3 form two functions with a preset number of decimal counters, of which P1 and P3, respectively, for months, and 10-bit counters, P2 to generate a 10-bit The binary signal ② P4 is the status register, control the state of the conversion, and six output control signals of traffic lights.
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Trafficlight.txt
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