TMPR3916 datasheet(81/225 Pages) TOSHIBA

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Chapter 3 Graphics Display Controller (GDC)

Preliminary

3-2

3.1

GDC Structure

3.1.1

Display Screen

The TMPR3916 can display four layers, overlaid in the following order: A/E, B, C and D. Top layer

is D (see Figure 3.1.1). Displaying layers A and E together is not possible because these layers use the

same resources except for color palette and dot buffer.

The blank signal BLK enables the display data output. The layer active signals LA, LB, LC and LD

activate each layer.

Layer D screen size can be set independently of the other layer sizes.

Layer A can be switched between Map mode and Picture mode (then called layer E). Use the LPA bit

of the display control register (DCR) to switch the modes.

Layer A/E

Layer B

Layer C

Layer D

LA, LPA data A/E:

Layer A/E displayed

LB data B:

(0),

Layer B displayed

LC data C:

(0),

Layer C displayed

LD data D:

(0),

Layer D displayed

Next layer displayed

Lx data x = 1

: Display

Lx data x = 0

: No display (transparent)

: Bit in display control register

data x

: Layer x display data

: A/E, B, C, D

Figure 3.1.1 Layer Arrangement

As can be seen in the figure above layer A/E will always be displayed if all other activated layers

contain transparent dots at the current location. Therefore it is recommended to always use one of these

two layers to prevent the system from reading dots in an undefined background.

For display dimensions the following restrictions apply: Layers A/E, B and C shall be configured at

least 64 dots wide horizontally, layer D should have 16 dots minimum. In vertical direction no

restriction exists.

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