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Epson Research and Development Page 115
Vancouver Design Center
Hardware Functional Specification S1D13708
Issue Date: 02/03/07 X39A-A-001-02
There is a relationship between the frequency of MCLK and PCLK that must be
maintained.
7.1.4 PWMCLK
PWMCLK is the internal clock used by the Pulse Width Modulator for output to the panel.
The source clock options for PWMCLK may be selected as in the following table.
For further information on controlling PWMCLK, see Section 8.3.9, “Pulse Width
Modulation (PWM) Clock and Contrast Voltage (CV) Pulse Configuration Registers” on
page 150.
Note
The S1D13708 provides Pulse Width Modulation output on the pin PWMOUT.
PWMOUT can be used to control LCD panels which support PWM control of the back-
light inverter.
Table 7-4: Relationship between MCLK and PCLK
SwivelView Orientation Color Depth (bpp) MCLK to PCLK Relationship
SwivelView 0° and 180°
16 f
MCLK
≥ f
PCLK
8f
MCLK
≥ f
PCLK
÷
2
4f
MCLK
≥ f
PCLK
÷
4
2f
MCLK
≥ f
PCLK
÷
8
1f
MCLK
≥ f
PCLK
÷
16
SwivelView 90° and 270° 16/8/4/2/1 f
MCLK
≥ 1.25f
PCLK
Table 7-5: PWMCLK Clock Selection
Source Clock Options PWMCLK Selection
CLKI REG[B1h] bit 0 = 0
CLKI2 REG[CAh] bit 1 = 0, REG[B1h] bit 0 = 1
XTAL REG[CAh] bit 1 = 1, REG[B1h] bit 0 = 1