Datasheet

Section 13 LCD Controller/Driver
Rev. 6.00 Aug 04, 2006 page 439 of 680
REJ09B0145-0600
Bits 3 to 0: Charge/discharge pulse duty cycle select (CDS3 to CDS0)
Bit 3
CDS3
Bit 2
CDS2
Bit 1
CDS1
Bit 0
CDS0 Duty Cycle Notes
0 0 0 0 1 Fixed high (initial value)
0 001 1/8
0 010 2/8
0 011 3/8
0 100 4/8
0 101 5/8
0 110 6/8
0 1 1 1 0 Fixed low
10** 1/16
11** 1/32
*: Don’t care
Bits 3 to 0 select the duty cycle while the power supply split-resistance is connected to the power
supply circuit.
When a 0 duty cycle is selected, the power supply split-resistance is permanently disconnected
from the power supply circuit, so power should be supplied to pins V
1
, V
2
, and V
3
by an external
circuit.
Figure 13.2 shows the waveform of the charge/discharge pulses. The duty cycle is Tc/Tw.
COM1
Charge/discharge
pulses
Tc Tdc
TW
1 frame
Tc
Tdc
: Power supply split-resistance
connected
: Power supply split-resistance
disconnected
Figure 13.2 Example of A Waveform with 1/2 Duty and 1/2 Bias