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M35072-059FP Datasheet(PDF) 17 Page - Mitsubishi Electric Semiconductor |
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M35072-059FP Datasheet(HTML) 17 Page - Mitsubishi Electric Semiconductor |
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17 / 52 page  MITSUBISHI MICROCOMPUTERS M35072-XXXFP SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS 17 REGISTER SUPPLEMENTARY DESCRIPTION (1) Setting external clock input and display frequency mode Setting external clock input and display frequency mode (by use of EXCK0 (12016), EXCK1 (12316) and DIV10 to DIV0 (12016), as explained here following. (a) When (EXCK1, EXCK0) = (0, 0) ......External synchronous 1 (External clock display) … Fosc = 20 to 70 MHz Input from the TCK pin a constant-period continuous external clock that synchronizes with the horizontal synchronous signal. And input from HOR pin a constant period continuous horizontal synchronous signal. Never stop inputting the clock while displaying. Do not have to set a display frequency because the clock just as it is entered from outside is used as the display clock. (b) When (EXCK1, EXCK0) = Setting disabled (c) When (EXCK1, EXCK0) = (1, 0) ......… Setting disabled (d) When (EXCK1, EXCK0) = (1, 1) ......External synchronous 2 (Internal oscillation clock display) … Fosc = 20 to 80 MHz Input from the TCK pin a constant-period continuous external clock that synchronizes with the horizontal synchronous signal. And input from HOR pin a constant-period continuous horizontal synchronous signal. Never stop inputting the clock while displaying. An internal clock which is in sync with the external input clock is used as the display clock. Because the display frequency equals the external clock frequency, set N1 (division value) that satisfies the below expressions to DIV10 to DIV0 (address 12016) for make the display frequency is equal to the external clock frequency. N1 = external clock frequency / horizontal synchronous frequency N1 = Also, set the display frequency range. (See the next page.) Fig. 4 Example of external clock input 10 Σ n = 0 2nDIVn Horizontal synchronous signal External clock Number of clock (N1) 1H |
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