AVR-based Scrolling text display
The display is controlled by an Atmel AVR-family microcontroller, AT90S2313.The display has seven rows containing 50 LEDs each. The display controller consists of seven transistors and seven 8-bit shift registers which all are controlled by the MCU (AT90S2313). Each transistor drives one row selecting whether it’s enabled or not. The shift registers are chained together, so their serial input is converted to parallel output of 56 bits, 50 of which is used to drive the columns. The last six bits remain unused.
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