There are two key differences between
internal and external pattern mode:
- Internal pattern mode only supports 1D patterns i.e the pattern
data is the same across the entire row or column of the DMD (Figure 7-12, Figure 7-13).
- Internal pattern mode enables user to design a simple system by
eliminating need of an external processor to generate and send patterns every
frame. In internal pattern mode one row or one column patterns are pre-loaded in
the flash memory and a command is send to DLPC3470 controller to display the
patterns. Implementation details on how to create patterns, save patterns in
Flash memory and load patterns from flash memory into the DLPC3470 controller’s
internal memory are described in Software Programmers Guide.
Internal pattern mode additionally
provides two configurations to trigger the display of patterns, free running mode
(shown in Figure 7-14) and trigger in mode (shown in Figure 7-15).