RM0082
RS_Color liquid crystal display controller (CLCD)
Doc ID 018672 Rev 1
753/844
[25:16]
CPL
10’h0
Clocks per line. This field specifies the number of actual CLCP
clocks to the LCD panel on each line. This is the number of PPL
divided by 1 for TFT, 4 or 8 for mono passive, or 2 2/3 for color
passive, minus one. This must be correctly programmed in
addition to PPL for the LCD controller to work correctly.
[15]
-
-
Reserved, do not modify, read as zero, write as zero.
[14]
IEO
1’h0
Invert output enable:
1’b0 =
CLAC
output pin is active HIGH in TFT mode
1’b1 =
CLAC
output pin is active LOW in TFT mode.
The invert output enable (IOE) bit is used to select the active
polarity of the output enable signal in TFT mode. In this mode,
the CLAC 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 CLCP when CLAC is in its active state.
[13]
IPC
1’h0
Invert panel clock:
1’b0 = Data is driven on the LCDs data lines on the rising-edge
of
CLCP
1’b1 = Data is driven on the LCDs data lines on the falling-edge
of
CLCP
.
The IPC bit is used to select the edge of the panel clock on
which pixel data is driven out onto the LCD data lines.
[12]
IHS
1’h0
Invert horizontal synchronization:
1’b0 =
CLLP
pin is active HIGH and inactive LOW
1’b1 =
CLLP
pin is active LOW and inactive HIGH.
The invert HSync (IHS) bit is used to invert the polarity of the
CLLP signal.
[11]
IVS
1’h0
Invert vertical synchronization:
1’b0 =
CLFP
pin is active HIGH and inactive LOW
1’b1 =
CLFP
pin is active LOW and inactive HIGH.
The invert VSync (IVS) bit is used to invert the polarity of the
CLFP signal.
[10:06]
ACB
5’h0
AC bias pin frequency. The AC bias pin frequency is only
applicable to STN displays, which require the pixel voltage
polarity to be periodically reversed to prevent damage due to DC
charge accumulation. Program this field with the required value
minus 1 to apply the number of line clocks between each toggle
of the AC bias pin,
CLAC
. This field has no effect if the CLCD is
operating in TFT mode when the
CLAC
pin is used as a data
enable signal.
[05]
CLKSEL
1’h0
This bit drives the CLCDCLKSEL signal that is used as the
select signal for the external CLCDCLK clock multiplexer.
1’b0 - HCLK
1’b1 - Other Clock
Table 678.
LCDTiming2 register bit assignments (continued)
Bit
Name
Reset
value
Description