Table of Contents
Advertisement
VChlMOD: V
regulator heavy load protection mode On/Off register (FF03h•D3)
C
Enables heavy load protection function for the LCD system voltage regulator.
When "1" is written: On
When "0" is written: Off
Reading: Valid
By writing "1" to VCHLMOD, the LCD system voltage regulator enters heavy load protection mode to mini-
mize degradation in display quality when fluctuations in the supply voltage occurs due to driving a heavy load.
The heavy load protection function is effective when the OSC3 clock is used or the buzzer/FOUT signal is being
output. However, heavy load protection mode increases current consumption compared with normal operation
mode. Therefore, do not set heavy load protection mode unless it is necessary. At initial reset, this register is set
to "0."
VCCKS[1:0]: V
boost frequency select register (FF12h•D[1:0])
C
Controls the boost clock supply to the LCD system voltage regulator.
The LCD system voltage regulator uses the boost clock supplied from the clock manager for boosting/reducing
the voltage. Use this register to control the clock supply. Set VCCKS[1:0] to "1" before writing "1" to LPWR.
When LCD display is not necessary, stop the clock supply by setting VCCKS[1:0] to "0" to reduce power con-
sumption. At initial reset, this register is set to "0."
5.6
Precautions
• When a 3.0 V LCD drive voltage is supplied to the V
power sources for V
and V
DD
• Do not use the V
, V
D1
OSC
• The LCD system voltage regulator takes about 100 msec for stabilizing the LCD drive voltages after writing "1"
to LPWR.
• Do not select the reference voltage V
• Current consumption increases in heavy load protection mode, therefore do not set heavy load protection mode
with software if unnecessary.
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
Table 5.
5.2 Controlling boost clock
VCCKS[1:0]
3 or 2
1
0
/V
and supply a voltage within 1.1 V to 1.7 V to the V
C3
C2
, and V
to V
terminal output voltages to drive external circuits.
C1
C3
for the S1C63003 1.5 V low-voltage type.
C2
Seiko epson Corporation
Boost clock control
Prohibited
On (2 kHz)
Off
or V
terminal in the 1.5 V low-voltage type, use separated
C3
C2
5 POWeR SuPPlY
terminal.
DD
5-5
Advertisement
Table of Contents
