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■ Erase light upper left coordinate register

Erase light upper left coordinate register (EWLR, Erase write left coordinate register) sets the upper left coordinate of the erase light area. This is a write-only 16-bit register at address 100008H. Since the value will be undefined after turning on the power or resetting, be sure to set the coordinates. Set unused bits to 0.

Erase light upper left coordinate X1: bits 14-9

Erase light upper left coordinate Y1: bits 8-0

■ Erase light lower right coordinate register

Erase light upper right coordinate register (EWRR, Erase write right coordinate register) sets the lower right coordinate of the erase light area. This is a write-only 16-bit register at 10000AH. Since the value will be undefined after turning on the power or resetting, be sure to set the coordinates.

Erase light bottom right coordinate X3: Bits 15-9

Erase light bottom right coordinate Y3: Bits 8-0

• Specify the fill area of ​​the frame buffer during erase write.
  
• The X coordinate is set in units of 8 pixels for 16 bit / pixel (normal, rotation 16, HDTV), and in units of 16 pixels for 8 bit / pixel (high resolution, rotation 8). When the system register value is 1, it is 8 or 16.
  The actual X coordinate at the lower right is the value obtained by subtracting 1 from the register setting value multiplied by 8 or 16.
  
• Y coordinate is set in units of one line. Since double-dense interlacing is twice the Y coordinate register setting value, set 1/2 of the actual coordinate value. For example, when the setting value is 223, the coordinate value is 447.
  
• The actual X coordinate is given by
  

  16bit / pixel

  Upper left coordinate X1 = Register set value x 8

  Lower right coordinate X3 = Register set value x 8−1

  8bit / pixel

  Upper left coordinate X1 = Register set value x 16

  Bottom right coordinate X3 = Register set value × 16-1
  

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