Table 57-30. LCD controller duty cycle modes
Duty
GCR
Number of backplanes
Phase sequence
DUTY2
DUTY1
DUTY0
1/1
0
0
0
1
A
1/2
0
0
1
2
A B
1/3
0
1
0
3
A B C
1/4
0
1
1
4
A B C D
1/5
1
0
0
5
A B C D E
1/6
1
0
1
6
A B C D E F
1/7
1
1
0
7
A B C D E F G
1/8
1
1
1
8
A B C D E F G H
57.4.1.2 LCD bias
Because a single frontplane driver is configured to drive more and more individual LCD
segments, 3 voltage levels are required to generate the appropriate waveforms to drive the
segment. The LCD controller is designed to operate using the 1/3 bias mode.
57.4.1.3 LCD controller base clock and frame frequency
The LCD controller is optimized to operate using a 32.768 kHz clock input. Two clock
sources are available to the LCD controller, which are selectable by configuring the
SOURCE bit in the GCR. The two clock sources include:
• Default clock (SOURCE = 0)
• Alternate clock (SOURCE = 1)
NOTE
The clock source is chip-specific. For the clock source
assignments, see the chapter that describes how modules are
configured.
The following figure shows the LCD clock tree. The clock tree shows the two possible
clock sources and the LCD frame frequency and blink frequency clock source. The LCD
blink frequency is discussed in
.
Functional description
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