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PCF8811U/2DA/1 数据表(PDF) 45 Page - NXP Semiconductors |
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PCF8811U/2DA/1 数据表(HTML) 45 Page - NXP Semiconductors |
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45 / 81 page  PCF8811_4 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 04 — 27 June 2008 45 of 81 NXP Semiconductors PCF8811 80 x 128 pixels matrix LCD driver When MX = 1 the display RAM is written from right to left (X = 0 is on the right side and X=Xmax is on the left side of the display). The MX bit has an impact on the way the RAM is written to. So if a horizontal mirroring of the display is desired, the RAM must first be rewritten, after changing the MX bit. 12.5.2 Bit MY When MY = 1, the display is mirrored vertically. A change to this bit has an immediate effect on the display. 12.6 Set Y address of RAM Y[3:0] defines the Y address of the display RAM. When the icon row (row 79) is enabled it will always be in bank 9 independent of the multiplex rate which is programmed. 12.7 Set X address of RAM The X address points to the columns. The range of X is 0 to 127 (7Fh). 12.8 Set display start line L[6:0] (see Table 11) is used to select the display line address of the display RAM to be displayed on the initial row, row 0. The selection of L[6:0] is limited to steps of 8. When the icon row is selected, the selection of L[6:0] is limited to steps of 16. When a partial mode is selected, the selection of L[6:0] is also limited in steps. In addition, the selection of L[6:0] = 72 is not allowed when the icon row is enabled or disabled. The initial row can, in turn, be set by C[6:0]; see Table 11. Row 0 cannot be set to icon row 79 when enabled. An example of the mapping from the RAM content to the display is shown in Figure 33. The content of the RAM is not modified. This feature allows, for instance, screen scrolling without rewriting the RAM. Table 22. RAM X/Y address range Y3 Y2 Y1 Y0 Content Allowed X range 0000 bank 0 (display RAM) 0 to 127 0001 bank 1 (display RAM) 0 to 127 0010 bank 2 (display RAM) 0 to 127 0011 bank 3 (display RAM) 0 to 127 0100 bank 4 (display RAM) 0 to 127 0101 bank 5 (display RAM) 0 to 127 0110 bank 6 (display RAM) 0 to 127 0111 bank 7 (display RAM) 0 to 127 1000 bank 8 (display RAM) 0 to 127 1001 bank 9 (display RAM) 0 to 127 |
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