clock: clocks out character columns or shifts in data. Data is 8bits LSB first. Highest bit is ignored. Data = b01xxxxxx ASCII character no x + 32. data = b00xxxxxx bitmap column. under/over is underline and overline for all bitmap columns
Shift in some data and set din = 1111111 to clock out characters and graphics
| # | Input | Output |
|---|---|---|
| 0 | clock | led 0 |
| 1 | reset | led 1 |
| 2 | write | led 2 |
| 3 | din | led 3 |
| 4 | under | led 4 |
| 5 | over | led 5 |
| 6 | none | led 6 |
| 7 | none | led 7 |