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MC141540P4 bảng dữ liệu(PDF) 7 Page - Motorola, Inc |
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MC141540P4 bảng dữ liệu(HTML) 7 Page - Motorola, Inc |
7 / 12 page MC141540 7 MOTOROLA 0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 15 16 lines 22 lines 34 lines 25 lines Built–in font Display character when CH=22 Display character when CH=34 when CH=25 Display character (10x16 matrix) when CH=16 Figure 6. Variable Character Height An IBM PC program called “MOSD Font Editor” (Rev. 2.0) was written for MC141540 editing purposes. This program generates a set of S–Record or Binary record for the desired display patterns to be masked onto the character ROM of the MC141540. In order to have better character display within windows, it is suggested that the designed character font be placed in the center of the 10 x 16 matrix with equal space on all four sides. The character $00 is predefined for blank characters, and the character $7F is predefined for full–filled characters. In order to avoid submersion of displayed symbols or char- acters into a background of comparable colors, a feature of bordering which encircles all four sides, or shadowing which encircles only the right and bottom sides of an individual dis- play character, are provided. Figure 7 shows how a character is jacketed differently. To make sure that a character is bor- dered or shadowed correctly, at least one blank dot should be reserved on each side of the character font. 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 7. Character Bordering and Shadowing Frame Format and Timing Figure 8 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 8 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. For ex- ample, dot frequency is 10.24 MHz if H freq is 32 kHz. Hence, a dot equals 1/10.24 µs. 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. |
Số phần tương tự - MC141540P4 |
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Mô tả tương tự - MC141540P4 |
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