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- 2012-11-26
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Description: Double digital tube adjustable stopwatch because single chip I/O adequate resources, so double digital tube may meet into static showing the way, two were Yin digital tube up in respectively P1 (ten seconds) and P2 (seconds bytes) mouth, they were all of the cathode grounding, arrange two buttons up in P3.2 (ten digits adjust) and P3.3 (single digits adjust), in order to facilitate the timing, choose 12 MHz crystals. In order to achieve precise timing, choose the timer way 2, each count 250 overloaded once, namely 250 us, define a variable number of heavy integer count, so that count 4000 times which is a one seconds. Define two bytes variable S10 and S1 separately calculated the ten seconds and seconds bytes.
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