Frame Management; Single Buffer; Double Buffer - Fujitsu MB86R02 Jade-D Hardware Manual

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MB86R02 'Jade-D' Hardware Manual V1.64

18.5 Frame Management

The entire drawing frame (or a part of it) can be assigned as a display frame. The displayed

area can be scrolled by relocating the position of the display frame. If the display frame crosses

the border of the drawing frame, the opposite side of the drawing frame is displayed, i.e. the

drawing frame is rolled over (top and left edges are assumed to be logically connected to the

bottom and right edges respectively). To avoid artefacts by drawing directly on the display,

drawing data can be transferred to the graphics memory in the blanking time period.

Two drawing frames are set up. While one frame is being displayed, drawing is done to the

other frame. Flicker-less animation can be performed by switching back and forth between

these two frames. Switching is done in the blanking time period. There are two switching

modes: automatically at every scan frame period or manually by user control. Double buffer is

assigned independently for the L2, L3, L4, L5 layers.