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UM10503
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User manual
Rev. 1.3 — 6 July 2012
773 of 1269
NXP Semiconductors
UM10503
Chapter 27: LPC43xx LCD
27.6.4 Line End Control register
The LE register controls the enabling of line-end signal LCDLE. When enabled, a positive
pulse, four LCDCLK periods wide, is output on LCDLE after a programmable delay, LED,
from the last pixel of each display line. If the line-end signal is disabled it is held
permanently LOW.
13
IPC
Invert panel clock.
The IPC bit selects the edge of the panel clock on which pixel
data is driven out onto the LCD data lines.
0 = Data is driven on the LCD data lines on the rising edge of
LCDDCLK.
1 = Data is driven on the LCD data lines on the falling edge of
LCDDCLK.
0x0
14
IOE
Invert output enable.
This bit selects the active polarity of the output enable signal in
TFT mode. In this mode, the LCDENAB pin is used as an enable
that indicates to the LCD panel when valid display data is
available. In active display mode, data is driven onto the LCD
data lines at the programmed edge of LCDDCLK when
LCDENAB is in its active state.
0 = LCDENAB output pin is active HIGH in TFT mode.
1 = LCDENAB output pin is active LOW in TFT mode.
0x0
15
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
25:16
CPL
Clocks per line.
This field specifies the number of actual LCDDCLK clocks to the
LCD panel on each line. This is the number of PPL divided by
either 1 (for TFT), 4 or 8 (for monochrome passive), 2 2/3 (for
color passive), minus one. This must be correctly programmed in
addition to the PPL bit in the TIMH register for the LCD display to
work correctly.
0x0
26
BCD
Bypass pixel clock divider.
Setting this to 1 bypasses the pixel clock divider logic. This is
mainly used for TFT displays.
0x0
31:27
PCD_HI
Upper five bits of panel clock divisor.
See description for PCD_LO, in bits [4:0] of this register.
0x0
Table 605. Clock and Signal Polarity register (POL, address 0x4000 8008) bit description
Bit
Symbol
Description
Reset
value