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STV9422 bảng dữ liệu(PDF) 10 Page - STMicroelectronics |
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STV9422 bảng dữ liệu(HTML) 10 Page - STMicroelectronics |
10 / 15 page FUNCTIONAL DESCRIPTION (continued) After the falling edge on V-SYNC, the first strip descriptor is read at the top of the current table of descriptors at the address given by P[9:0] (see DISPLAY CONTROL register). If it is a spacing strip, SL[7:0] black or transparent scan lines are displayed. If it is a character strip, during CH[5:0] x (I + ZY) scan lines (CH[5:0] given by the CHARACTER HEIGHT register), the character codes are read at the addresses starting from the 1 st one given by the descriptor until a end of line character or the end of the scan line. The next descriptor is then read and the same proc- ess is repeated until the next falling edgeon V-SYNC. CSD FBK FL[1:0] P8 P7 P8 DISPLAY CONTROL Register TABLE OF THE DESCRIPTORS 2nd CHARACTER STRIP CODES OTHER TABLE OF DESCRIPTORS OTHER (UDC for example) 1st CHARACTER STRIP CODES 3rd CHARACTER SRTIP CODES OTHER (CODES OR DESCRIPTORS) SPACING ROW1 ROW2 SPACING ROW3 SPACING RAM CODE AND DESCRIPTORS V-SYNC TOP SPACING STRIP 1st CHARACTER STRIP 2nd CHARACTER STRIP 3rd CHARACTER STRIP SPACING STRIP | BOTTOM SPACING STRIP SCREEN Figure 7 : Relation between Screen/Address Page/Character Code in RAM Slice 18 of the character n °2 only for vertical shadowing (not displayed). 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 123 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 456 36 Pixels (= 3 Characters) Character Number Character Number ON THE SCREEN (example for Character n °5) IN THE RAM Slice 0 Slice 1 Slice 2 Slice 3 Slice 4 Slice 5 Slice 6 Slice 7 Slice 8 Slice 9 Slice 10 Slice 11 Slice 12 Slice 13 Slice 14 Slice 15 Slice 16 Slice 17 Slice 18 : 0x01 : 0x00 : 0x08 : 0x0c : 0x0e : 0x0f : 0x0f : 0x0f : 0x0f : 0x0e : 0x0c : 0x00 : 0x00 : 0x00 : 0x00 : 0x00 : 0x00 : 0x00 : 0x00 0xff = 0xff 0x7f 0x3f 0x1f 0x1f 0x1f 0x1e 0x1e 0x3c 0x3c 0x78 0x78 0xf1 0x00 0x00 0x00 0x00 0x00 Odd Address Even Address Figure 8 : User Definable Character STV9422 - STV9424 10/15 |
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