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PCF8833 Datasheet(PDF) 35 Page - NXP Semiconductors |
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PCF8833 Datasheet(HTML) 35 Page - NXP Semiconductors |
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35 / 112 page  2003 Feb 14 35 Philips Semiconductors Objective specification STN RGB - 132 × 132 × 3 driver PCF8833 6.2.24.1 Rolling Scroll mode The RAM-to-display mapping for the rolling Scroll mode when a 132 × 130 (columns × rows) display is connected to the PCF8833 is illustrated in Fig.14. In this case rows 0 and 131 must be left open. When a 132 × 132 display is connected, there will be a one-to-one mapping between the RAM and the display, and there will be no unused rows. The rolling Scroll mode is activated when the Set Entry Scroll Point (SEP) is set; see Table 35. Figure 15 gives an example for when the PCF8833 is working in the rolling Scroll mode. When the rolling Scroll mode is used the following sequence can be applied: • After the desired time interval increment the scroll address to SEP + n for a n-line step • Keep incrementing the scroll address (SEP) at regular intervals. The rolling Scroll mode is left when the normal Display mode on (NORON) or the partial Display mode on (PTLON) is selected. Table 35 Set entry scroll point register bits D/C 7 D6 543210 DEFAULT 000110111 37H 1 SEP7 SEP6 SEP5 SEP4 SEP3 SEP2 SEP1 SEP0 00H handbook, full pagewidth 0 1 2 3 4 5 8 6 7 126 129 130 131 127 128 123 122 121 124 125 TF[7:0] SA[7:0] BF[7:0] TF[7:0] SA[7:0] BF[7:0] RAM (132 x 132) 0 0 1 2 3 4 7 8 5 6 127 130 131 131 128 129 124 121 120 125 126 display (132 x 130) 2 unused rows MGU923 Fig.14 RAM to display mapping for the rolling Scroll mode (TF + SA + BF = 130) for LAO = 0. |
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