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MC141541 Folha de dados(PDF) 10 Page - Motorola, Inc |
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MC141541 Folha de dados(HTML) 10 Page - Motorola, Inc |
10 / 16 page MC141541 MOTOROLA 10 Table 2. Resolution Setting Register Setting (32B) 0 1 Dot Number per H Sync Line 320 480 0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 15 Bordering 0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 15 Shadowing Figure 11. Character Bordering and Shadowing Frame Format and Timing Figure 12 illustrates the positions of all display characters on the screen relative to the leading edge of horizontal and vertical flyback signals. The shaded area indicates the area outside the “safe viewing area” for the display characters. Notice that there are two components in the equations stated in Figure 12 for horizontal and vertical delays: fixed delays from the leading edge of HFLB and VFLB signals, regardless of the values of HORD and VERTD (47 dots + phase detec- tion pulse width) and one H scan line for horizontal and verti- cal delays, respectively; and variable delays determined by the values of HORD and VERTD. Refer to Frame Control Registers Coln 9 and 10 for the definitions of VERTD and HORD. Phase detection pulse width is a function of the external charge–up resistor, which is the 330 k Ω resistor in a series with 2 k Ω to VCO pin in the Application Diagram. Dot fre- quency is determined by the equation H freq x 320 if Bit X32B is clear, and H freq x 480 if Bit X32B is set to 1 and Bit X64 is 0. For example, dot frequency is 10.24 MHz if H freq is 32 kHz while Bit X32B is 0. If Bit X32B is 1 and Bit X64 is 0, the dot frequency will be 15.36 MHz (one and a half of the original one). When double character width is selected for a row, only the even–numbered characters will be displayed, as shown in Row 2. Notice that the total number of horizontal scan lines in the display frame is variable, depending on the chosen char- acter height of each row. Care should be taken while config- uring each row character height so that the last horizontal scan line in the display frame always comes out before the leading edge of VFLB of the next frame, to avoid wrapping display characters of the last few rows in the current frame into the next frame. The number of display dots in a horizon- tal scan line is always fixed at 240, regardless of row charac- ter width and the setting of Bit X32B. VFLB . . . . . . variable number of H scan lines vertical delay = VERTD x 4 + 1 H scan lines Figure 12. Display Frame Format |
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