Toshiba TLCS-900/H1 Series Manual page 343

3.14.3.2 Memory Space (Common spec. SR mode and TFT mode)
The LCDC can display an LCD panel image which is divided horizontally into 3
parts; upper, middle and lower. Each area is called A area, B area and C area with the
characteristics shown below.
The Start/End address of each area in the physical memory space can be defined in
the LCD start/end address registers. C area can be defined only in start address.
A and B areas can be displayed by program and set to enable or not in Start Address
register and Row Number register. When the Row Number registers of A and B areas
are set to 0, C area takes over all panel space.
When the size of A or B area is greater than the LCD panel, the area of the panel is
all C area because the displaying priority is A > B > C. If the A area is set to enable
while the panel area is defined as all C area (A and B areas are disabled), C area is
shifted below the LCD panel and A area is inserted from the top of the LCD panel.
Similarly if the B area is set to enable while the panel area is defined as all C area, B
area is inserted from the bottom of the C area overlapping.
Logic address
400000H Ya A area
B area
Yb
Row
address
C area
Yc
Horizontal pan
600000H
Figure 3.14.1 Memory Mapping from Physical Memory to LCD Panel
Reserved area for horizontal pan of
Memory map
C area
image
* Display data cannot input closely when
pan function is not used.
Column address
Vertical pan
2X
92CH21-341
TMP92CH21
LCD Panel
image
X
Ya
A area
C area
Yc
B area
Yb
2009-06-19