Introduction - If you have any usage issues, please Google them yourself
Microcomputer Lab 82551) with eight LEDs to reflect the status of the eight switch, toggle switch, so that the corresponding lights. 2) 8255 the design of the control of traffic lights with LED to simulate traffic lights. Please consider the 8255 LED connection, as well as how to use 8255 to control the LED lit and extinguished. Traffic light control process: things green light to the north and south to the red light for 5 seconds. Green light off of the east-west and north-south red light, something to the yellow light flashes 5 times in this time period, every time bright 0.5 seconds every 0.5 seconds. The green light of the north-south, east to west, the red light is on for 5 seconds. Green light off of the north-south, east-west red light, in this period of time in the north and south to the yellow light flashes 5 times, and every time bright 0.5 seconds every 0.5 seconds. This rule repetitive control.