NXP Semiconductors LPC24XX UM10237 - Manual (Page 284)

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User manual Rev. 04 — 26 August 2009 284 of 792
NXP Semiconductors
UM10237
Chapter 12: LPC24XX LCD controller
• 16 bpp, direct 4:4:4 RGB, with 4 bpp not being used.
4.6 Monochrome STN panels
Monochrome STN panels support one or more of the following modes:
• 1 bpp, palettized, 2 gray scales selected from 15.
• 2 bpp, palettized, 4 gray scales selected from 15.
• 4 bpp, palettized, 16 gray scales selected from 15.
More than 4 bpp for monochrome panels can be programmed, but using these modes has
no benefit because the maximum number of gray scales supported on the display is 15.
5. Pin description
The largest configuration for the LCD controller uses 31 pins. There are many variants
using as few as 10 pins for a monochrome STN panel. Pins are allocated in groups based
on the selected configuration. All LCD functions are shared with other chip functions. In
Table 12–242 , only the LCD related portion of the pin name is shown.
Remark: To enable the LCD controller, see Section 9–5.12 .
5.1 Signal usage
The signals that are used for various display types are identified in the following sections.
5.1.1 Signals used for single panel STN displays
The signals used for single panel STN displays are shown in Table 12–243 . UD refers to
upper panel data.
Table 242. LCD controller pins
Pin name Type Function
LCDPWR output LCD panel power enable.
LCDDCLK output LCD panel clock.
LCDENA/LCDM output STN AC bias drive or TFT data enable output.
LCDFP output Frame pulse (STN). Vertical synchronization pulse (TFT)
LCDLE output Line end signal
LCDLP output Line synchronization pulse (STN). Horizontal synchronization pulse
(TFT)
LCDVD[23:0] output LCD panel data. Bits used depend on the panel configuration.
LCDCLKIN input Optional clock input.
Table 243. Pins used for single panel STN displays
Pin name 4-bit Monochrome
(10 pins)
8-bit Monochrome
(14 pins)
Color
(14 pins)
LCDPWR Y Y Y
LCDDCLK Y Y Y
LCDENAB/ LCDM Y Y Y
LCDFP Y Y Y