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455A Datasheet(PDF) 45 Page - Renesas Technology Corp |
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455A Datasheet(HTML) 45 Page - Renesas Technology Corp |
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45 / 148 page  Rev.1.01 Feb 15, 2008 Page 45 of 146 REJ03B0224-0101 455A Group (2) LCD clock control The LCD clock is determined by the timer LC setting value and timer LC count source. After setting data to timer LC, timer LC starts counting by setting count source with bit 2 of register W4 and setting bit 3 of register W4 to “1.” Accordingly, the frequency (F) of the LCD clock is obtained by the following formula. Numbers ((1) to (3)) shown below the formula correspond to numbers in Figure 44, respectively. • When using the system clock (STCK) as timer LC count source (W42=“1”) • When using the bit 4 of timer 3 as timer LC count source (W42=“0”) The frame frequency and frame period for each display method can be obtained by the following formula: Fig 44. LCD clock control circuit structure (3) LCD RAM RAM contains areas corresponding to the liquid crystal display. When “1” is written to this LCD RAM, the display pixel corresponding to the bit is automatically displayed. Fig 45. LCD RAM map F = STCK × × (1) (2) (3) [LC: 0 to 15] LC + 1 1 2 1 F = T34 × × (1) (2) (3) [LC: 0 to 15] LC + 1 1 2 1 Frame frequency = (Hz) Frame frequency = (Hz) F: LCD clock frequency 1/n: Duty n F F n Timer LC (4) Reload register RLC (4) (TLCA) Register A 1/2 LCD clock (TLCA) W42 0 1 W43 T34 STCK (3) (1) (2) Z X 1 8 9 10 11 12 13 14 15 COM Y bit 12 SEG0 SEG1 0 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 COM0 SEG0 SEG1 1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 COM1 SEG0 SEG1 2 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 COM2 SEG0 SEG1 3 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 COM3 13 SEG8 SEG9 0 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 COM0 SEG8 SEG9 1 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 COM1 SEG8 SEG9 2 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 COM2 SEG8 SEG9 3 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 COM3 14 SEG16 SEG17 0 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 COM0 SEG16 SEG17 1 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 COM1 SEG16 SEG17 2 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 COM2 SEG16 SEG17 3 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 COM3 15 SEG24 SEG25 0 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 COM0 SEG24 SEG25 1 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 COM1 SEG24 SEG25 2 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 COM2 SEG24 SEG25 3 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 COM3 |
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