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Epson Research and Development Page 113
Vancouver Design Center
Hardware Functional Specification S1D13708
Issue Date: 02/03/07 X39A-A-001-02
7.1.3 PCLK
PCLK is the internal clock used to control the LCD panel. PCLK should be chosen to match
the optimum frame rate of the LCD panel. See Section 9, “Frame Rate Calculation” on page
171 for details on the relationship between PCLK and frame rate.
Some flexibility is possible in the selection of PCLK. Firstly, LCD panels typically have a
range of permissible frame rates. Secondly, it may be possible to choose a higher PCLK
frequency and tailor the horizontal and vertical non-display periods to lower the frame-rate
to its optimal value.
The source clock options for PCLK may be selected as in the following table.
Table 7-2: MCLK Clock Selection
Source Clock Options MCLK Selection
BCLK REG[04h] bit 5,4 = 00
BCLK
÷
2 REG[04h] bit 5,4 = 01
BCLK ÷
3 REG[04h] bit 5,4 = 10
BCLK ÷
4 REG[04h] bit 5,4 = 11
Table 7-3: PCLK Clock Selection
Source Clock Options PCLK Selection
MCLK REG[05h] = 00h
MCLK
÷
2 REG[05h] = 10h
MCLK ÷
3 REG[05h] = 20h
MCLK ÷
4 REG[05h] = 30h
MCLK ÷
8 REG[05h] = 40h
BCLK REG[05h] = 01h
BCLK
÷
2 REG[05h] = 11h
BCLK ÷
3 REG[05h] = 21h
BCLK ÷
4 REG[05h] = 31h
BCLK ÷
8 REG[05h] = 41h
CLKI REG[05h] = 02h
CLKI
÷
2 REG[05h] = 12h
CLKI ÷
3 REG[05h] = 22h
CLKI ÷
4 REG[05h] = 32h
CLKI ÷
8 REG[05h] = 42h
CLKI2 REG[CAh] bit 1 = 0, REG[05h] = 03h
CLKI2
÷
2 REG[CAh] bit 1 = 0, REG[05h] = 13h
CLKI2 ÷
3 REG[CAh] bit 1 = 0, REG[05h] = 23h
CLKI2 ÷
4 REG[CAh] bit 1 = 0, REG[05h] = 33h
CLKI2 ÷
8 REG[CAh] bit 1 = 0, REG[05h] = 43h