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TMPR3916 Datasheet(PDF) 87 Page - Toshiba Semiconductor |
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TMPR3916 Datasheet(HTML) 87 Page - Toshiba Semiconductor |
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87 / 225 page  Chapter 3 Graphics Display Controller (GDC) Preliminary 3-8 3.1.4.1 Dot Clock The dot clock is the reference clock for graphics data output. It is also used to determine the screen size, for example, of each layer. Use the following formula to select the dot clock: s) ( period display horizontal dots) visible non (including line per dots display of number = (MHz) speed clock Dot µ Note that the internal circuit imposes the following restriction: dot clock speed (MHz) < ½ SYSCLK. The dot clock can be provided internally as a derivative of the system clock. The divisor is defined by DCKPS (see Display Control Register (DCR)) and can be set to 4, 6, 8, …, 24. Therefore frequencies of 2.5 MHz up to 15 MHz can be reached when using the internal dot clock. Default setting for DCKPS is 0x4h for a dot clock of 6 MHz. Alternatively the dot clock may be input via the DOTCLK pin. 3.1.5 Color Palette In Map mode, each dot can be set for 16 colors using layer C or D and 256 colors using layer A or B. By using the color palette, any 16 or 256 colors respectively can be selected from among the 65,536 colors. The color palette can be set independently for each layer (A, B, C or D). One of the defined colors is transparent for layers B, C and D. It must not be used if no background layer is activated. In Picture mode (layer E), the TMPR3916 can display up to 65,536 colors. The dot data are directly defined at the frame buffer and therefore no color palette is necessary. When programming values to CLUT entries the upper 16 bits of the bus represent the color value, the lower 16 data bits are ignored. Example: For programming entry #7 in layer A’s color look-up table to a color with a red part of R = 20, a green pixel G = 23 and a blue one of B = 48, load 0xA5F00000 into memory location 0x1C05081C. The following table shows the color palette structure: Layer Palette Name Number of Colors Color Palette No. Address Color Specification A CPLTA 256 colors 0 1 : 255 1C05 0800 1C05 0804 : 1C05 0BFC free defined color 0 free defined color 1 : free defined color 255 B CPLTB 255 colors 0 1 : 255 1C05 0C00 1C05 0C04 : 1C05 0FFC transparent free defined color 0 : free defined color 254 C CPLTC 15 colors 0 1 : 15 1C05 0180 1C05 0184 : 1C05 01BC transparent free defined color 0 : free defined color 14 D CPLTD 15 colors 0 1 : 15 1C05 01C0 1C05 01C4 : 1C05 01FC transparent free defined color 0 : free defined color 14 |
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