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MC141541P Scheda tecnica(PDF) 11 Page - Motorola, Inc |
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MC141541P Scheda tecnica(HTML) 11 Page - Motorola, Inc |
11 / 16 page MC141541 11 MOTOROLA Although there are 24 character display registers that can be programmed for each row, not every programmed charac- ter can be shown on the screen in 320–dot resolution. Usual- ly only 24 characters can be shown in this resolution at most. This is induced by the time that is required to retrace the H scan line. At 480–dot resolution, a total of 24 characters can be displayed on the screen if the horizontal delay register is set properly. Figure 13 illustrates the timing of all output signals as a function of window and fast–blanking features. Line 3 of all three characters is used to illustrate the timing signals. The shaded area depicts the window area. The characters on the left and right appear identical except for the FBKGC bit. The middle character does not have a window as its background. Notice that signal HTONE/PWMCK is active only in the win- dow area. Timing of the signal FBKG depends on the config- uration of the FBKGC bit. The configuration of the FBKGC bit affects only the FBKG signal timing; it has no effect on the timing of HTONE/PWMCK. Waveform ‘R, G, or B’, which is the actual waveform at R, G, or B pin, is the logical OR of waveform ‘character R, G, or B’ and waveform ‘window R, G, or B’. ‘Character R, G, or B’ and ‘window R, G, or B’ are inter- nal signals for illustration purpose only. Also notice that HTONE/PWMCK has exactly the same waveform as ‘win- dow R, G, or B’. Figure 13. Timing of Output Signals as a Function of Window and FBKGC Bit Features FONT Icon Combination MC141541 contains 120–character ROM and eight RAM. The user can create an on–screen menu based on those characters and programmable RAM. Refer to Table 3 for icon combinations. Table 3. Combination Map ICON ROM ADDRESS (HEX) Volume Bar I 48, 49, 57 Volume Bar II 47 Size 4F, 50 Position 51, 52 Geometry 53, 54, 55, 56 Contrast 58,59 Brightness 5A, 5B Horizontal Position 5C, 5D Horizontal Sizing 5E, 5F Vertical Position 60, 61 Vertical Sizing 62, 63 Pin Cushion 64, 65 Deguassing 66, 67 Trapezoid 6C, 6D, 6E, 6F Parallelogram 68, 69, 6A, 6B Color Select 70, 71 Video Level 72, 73 Input Select 74, 75 Recall 76,77 Save 78, 79 Left/Right Arrows 7A, 7B INC/DEC sign 7C, 7D Speaker 7E, 7F ROM CONTENT Figures 14 – 17 show the ROM content of MC141541. |
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