Chapter 8 — Scanning and Persistence of Vision
This chapter will explain the timing trick behind the TEC-1G displays.
Planned coverage:
- why the six digits are not all independently latched
- showing one digit at a time
- cycling quickly enough that the eye sees a stable display
- the old television analogy: scan repeatedly and depend on persistence of vision
- what happens when the scan loop is too slow
- why hardware refresh becomes part of the program’s job
- how this same idea prepares you for the 8x8 RGB matrix
This is the conceptual hinge of Book 2. Once scanning is clear, the six-digit display, one-bit sound service, and 8x8 matrix all become easier to understand.