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S1D2502B01 Datasheet(PDF) 26 Page - Samsung semiconductor |
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S1D2502B01 Datasheet(HTML) 26 Page - Samsung semiconductor |
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26 / 61 page  VIDEO AMP MERGED OSD PROCESSOR FOR MONITORS S1D2502B01 25 Preliminary Frame Control Registers — 0 (Row 15, Column 00) BliT (Bit 0) Blink time control If this bit is '1', blink time is 0.5sec, and if not, 1sec. Bli1, Bli0 (Bit 2 — 1) Blinking duty control As the font blinks, there is a time when it is visible and invisible on screen. Blinking duty is the ratio of the invisible time to the visible time, and is decided by the combination of these two bits. In other words, blinking duty is the length of time the font is shown on screen. ScrT (Bit 3) Scroll time control If this bit is '1', scroll time is 0.5sec, and if not, 1sec. Scrl (Bit 4) Scroll enable Scrolling effect is controlled by this bit. If this bit is ‘1’, scrolling effect is enabled. You must remember that scrolling can be turned on/off only when OSD is enabled/disabled. EN (Bit 5) OSD enable OSD is enabled when this bit is '1'. In other words, if this bit isn't '1'OSD is not output inspite of writing control data. We recommend that you enable the OSD after setting the control registers (such as the character & attribute register) because of video and OSD output timing. Erase (Bit 6) RAM erasing If this bit is '1', the RAM data (character & attribute registers and row attribute registers) is erased. The time spent in carrying out this operation is called erasing time, which can be calculated as follows. Therefore, the maximum erasing time value is: Table 11. Register Description (Continued) Registers Bits Description Bli1 Bli0 Blinking Duty 0 0 Blink Off 0 1 Duty 25% 1 0 Duty 50% 1 1 Duty 75% Erasing time = RAM clock × 480 (RAM cell no.) RAM clock = 12 dot clock Dot clock = 1/(dot frequency) Dot frequency = Horizontal frequency × resolution (mode) (Erasing Time)MAX = (12 × 480) / (15k × 320) = 1.2ms |
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