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MTV121 데이터시트(PDF) 5 Page - List of Unclassifed Manufacturers |
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5 / 18 page 5/18 MTV121 Revision 5.0 06/29/1999 MTV121 MYSON TECHNOLOGY The data transmission is permitted to change from format (a) to format (b) and (c), or from format (b) to format (a), but not from format (c) back to format (a) and (b). The alternation between transmission formats is config- ured as the state diagram shown in Figure 3. 3.2 Address bus administrator The administrator manages bus address arbitration of internal registers or user fonts RAM during external data write in. The external data write through serial data interface to registers must be synchronized by inter- nal display timing. In addition, the administrator also provides automatic increment to address bus when exter- nal write using format (c). 3.3 Vertical display control The vertical display control can generates different vertical display sizes for most display standards in current monitors. The vertical display size is calculated with the information of double character height bit(CHS), verti- cal display height control register(CH6-CH0).The algorithm of repeating character line display are shown as Table 2 and Table 3. The programmable vertical size range is 270 lines to maximum 2130 lines. TABLE 1. The configuration of transmission formats. Address b7 b6 b5 b4 b3 b2 b1 b0 Format Address Bytes of Display Reg. Row 1 0 0 x R3 R2 R1 R0 a,b,c Columnab 0 0 x C4 C3 C2 C1 C0 a,b Columnc 0 1 x C4 C3 C2 C1 C0 c Attribute Bytes of Display Reg. Row 1 0 1 x R3 R2 R1 R0 a,b,c Columnab 0 0 x C4 C3 C2 C1 C0 a,b Columnc 0 1 x C4 C3 C2 C1 C0 c Initiate ROW COL c COL ab DA c DA ab 1, X 0, 1 0, 1 1, X 1, X format (a) format (b) format (c) X, X 0, X Input = b7, b6 0, 0 FIGURE 3. Transmission State Diagram |
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