NXP Semiconductors UM10237 6.5.2 Cursor sizes, 6.5.3 Cursor movement, 6.5.4 Cursor XY positioning

UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 294 o f 792
NXP Semiconductors UM10237
Chapter 12: LPC24XX LCD controller
When the display point is inside the bounds of the cursor image, the cursor replaces
frame buffer pixels with cursor pixels.
When the last cursor pixel is displayed, an interrupt is generated that software can use as
an indication that it is safe to modify the cursor image. This enables software controlled
animations to be performed without flickering for frame synchronized cursors.
6.5.2 Cursor sizes
Two cursor sizes are supported, as shown in Table 12–253.
6.5.3 Cursor movement
The following descriptions assume that both the screen and cursor origins are at the top
left of the visible screen (the first visible pixel scanned each frame). Figure 12–37 shows
how each pixel coordinate is assumed to be the top left corner of the pixel.
6.5.4 Cursor XY positioning
The CRSR_XY register controls the cursor position on the cursor overlay (see Cursor XY
Position register). This provides separate fields for X and Y ordinates.
The CRSR_CFG register (see Cursor Configuration register) provides a FrameSync bit
controlling the visible behavior of the cursor.
Table 253. Palette da ta storage for STN monochrome mode.
X Pixels Y Pixels Bits per pixel Words per line Words in cursor image
32 32 2 2 64
64 64 2 4 256
Fig 37. Cursor movement
CRSR_XY(X)
CRSR_XY(Y)
(0,0)