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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
765 of 1269
NXP Semiconductors
UM10503
Chapter 27: LPC43xx LCD
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Display type: STN monochrome, STN color, or TFT
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STN 4 or 8-bit interface mode
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STN dual or single panel mode
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Little-endian, big-endian, or Windows CE mode
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Interrupt generation event
27.4.2 Hardware cursor support
The hardware cursor feature reduces software overhead associated with maintaining a
cursor image in the LCD frame buffer.
Without this feature, software needed to:
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Save an image of the area under the next cursor position.
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Update the area with the cursor image.
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Repair the last cursor position with a previously saved image.
In addition, the LCD driver had to check whether the graphics operation had overwritten
the cursor, and correct it. With a cursor size of 64x64 and 24-bit color, each cursor move
involved reading and writing approximately 75 kB of data.
The hardware cursor removes the requirement for this management by providing a
completely separate image buffer for the cursor, and superimposing the cursor image on
the LCD output stream at the current cursor (X,Y) coordinate.
To move the hardware cursor, the software driver supplies a new cursor coordinate. The
frame buffer requires no modification. This significantly reduces software overhead.
The cursor image is held in the LCD controller in an internal 256x32-bit buffer memory.
27.4.3 Types of LCD panels supported
The LCD controller supports the following types of LCD panel:
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Active matrix TFT panels with up to 24-bit bus interface.
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Single-panel monochrome STN panels (4-bit and 8-bit bus interface).
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Dual-panel monochrome STN panels (4-bit and 8-bit bus interface per panel).
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Single-panel color STN panels, 8-bit bus interface.
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Dual-panel color STN panels, 8-bit bus interface per panel.
27.4.3.1 TFT panels
TFT panels support one or more of the following color modes:
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1 bpp, palettized, 2 colors selected from available colors.
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2 bpp, palettized, 4 colors selected from available colors.
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4 bpp, palettized, 16 colors selected from available colors.
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8 bpp, palettized, 256 colors selected from available colors.
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12 bpp, direct 4:4:4 RGB.