RAiO RA8806 - Display Future

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Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller REG [20h] Active Window Right Register (AWRR) Bit Description Default Access 7-6 Reserved 00 R Active Window Right Position Segment-Right 5-0 Note: AWRR must be equal or larger then AWLR, and less or equal then the value 27h (40 in decimal). Note: REG[20h, 30h, 40h, and 50h] are used to dominate an active window for line/row changing when writing data. Users can use these four registers to set the left/right/top/bottom boundary of active window. When data goes beyond the right boundary of it, the cursor will automatically change the next line to write data. It will move to the left boundary of new line in active window. When the data comes to the right-bottom corner, the next write will cause the cursor to move to the left-top corner. REG [21h] Display Window Width Register (DWWR) Bit Description Default Access 7-6 Reserved 00 R 5-0 Set Display Window Width Position Segment-Width Segment-Right = (Segment Number / 8) – 1 If LCD panel resolution is 320x240, the value of the register is: ( 320 / 8 ) - 1 = 39 = 27h Note: REG[21h, 31h] are used to set Display Window Resolution. Users can set the viewing scope of Display Data RAM. Column width (DWWR) of RA8806 can be set between 0h ~ 27h, and Row height (DWHR) can be set between 0h ~ EFh. 27h 27h R/W R/W REG [30h] Active Window Bottom Register (AWBR) Bit Description Default Access 7-0 Active Window Bottom Position Common-Bottom Note: AWBR must be equal or larger then AWTR, and less or equal then the value EFh(239 in decimal) REG [31h] Display Window Height Register (DWHR) Bit Description Default Access 7-0 Display Window Height Position Common- Height Common_ Height = LCD Common Number –1 If LCD panel resolution is 320x240, the value of the register is: 240 – 1 = 239 = EFh EFh EFh R/W R/W RAiO TECHNOLOGY INC. 18/193 www.raio.com.tw
Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller REG [40h] Active Window Left Register (AWLR) Bit Description Default Access 7-6 Reserved 00 R 5-0 Active Window Left Position Segment-Left Note: AWLR must be equal or less then AWRR, and less then the value 27h(39 in decimal) 00h R/W REG [50h] Active Window Top Register (AWTR) Bit Description Default Access 7-0 Active Window Top Position Common-Top Note: AWTR must be equal or less then AWBR, and less then the value EFh (239 in decimal) REG [60h] Cursor Position X Register (CURX) Bit Description Default Access 7-6 Reserved 00 R 5-0 Cursor Position of Segment / RAM0 Address[4:0] Define the cursor address of segment, a value from 0h ~ 27h(0 ~ 40 in decimal) When CGRAM write mode is selected (REG[12h] Bit[1:0] = 00b), the Bit[4:0] is the address for writing bit-map data. When create a full-size font, normally set to 0. When create an odd half-size font, normally set to 0, and set 10h for even font. REG [61h] Begin Segment Position Register of Scrolling (BGSG) Bit Description Default Access 7-6 Reserved 00 R 5-0 Segment Start Position of Scrolling Mode REG[61h] defines the start position (left boundary) of scroll window, it must be a value that less or equal to the REG[62h], which defines the 00h R/W end position(right boundary) of scroll window. Also it must be less then the value of 27h (40 in decimal), for the Display Data RAM limit. Note: REG[61h, 62h, 71h, 72h] dominate a named scroll window for scroll function. They must be set before the scroll function is enable. REG [62h] End Segment Position Register of Scrolling (EDSG) Bit Description Default Access 7-6 Reserved 00 R Segment End Position of Scrolling Mode REG[62h] defines the end position(right boundary) of scroll window, it 5-0 must be a value that larger or equal to the REG[61h], which defines the end position(left boundary) of scroll window. Also it must be less or equal then the value of 27h(40 in decimal), for the Display Data RAM limit. 00h R/W 00h 00h R/W R/W RAiO TECHNOLOGY INC. 19/193 www.raio.com.tw
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