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Manual Display Change Mode: In manual display change mode, display frame switching
and the start of drawing are controlled by software. Display switching can be performed either by
performing FB0/FB1 switching with an SYSR DC bit setting by software, or by setting the start
address of FB0 or FB1 in the display start address register indicated by DBF in SR. The start of
drawing is controlled by the RS bit in SYSR. Interrupts by means of the VBK flag and TRA flag
in SR are used for the control timing. An outline of operation when using the DC bit in this mode
is shown in figure 3-11. When switching from this mode to another double-buffering control
mode, the DC bit must first be set to 1.
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