S1C63666 TECHNICAL MANUAL
EPSON
11
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
4.5 V LCD panel
1/8, 1/5 or 1/4 duty, 1/3 bias
3 V LCD panel
1/8, 1/5 or 1/4 duty, 1/3 bias
3 V LCD panel
1/8, 1/5 or 1/4 duty, 1/2 bias
C
2
C
4
C
1
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
C
2
C
3
C
1
V
DD
V
C1
V
C2
V
C3
CA
CB
V
SS
3.0 V
C
2
C
1
Fig. 2.1.5.1 External elements when LCD system voltage regulator is not used
Refer to Section 4.8, "LCD Driver", for control of the LCD drive voltage.
2.1.6 Halver mode and saving power
When the supply voltage V
DD
is 2.4 V or more, the low-speed operation voltage regulator and LCD
system voltage circuit can be driven with the V
DD
voltage halved. This status is the halver mode for
reducing current consumption during HALT or low-speed operation. At initial reset, the low-speed
operation voltage regulator and LCD system voltage circuit are set in the normal mode using V
DD
. When
necessary switch to the halver mode using software. The halver mode supports only low-speed operation
using the OSC1 clock and cannot be set during high-speed operation using the OSC3 clock. The low-
speed operation voltage regulator and the LCD system voltage circuit can be set to the halver mode
independently. Refer to Section 4.2, "Power Control", for control of the halver mode.
2.1.7 Analog system power supply
The V
DDA
and V
SSA
power supply terminals are provided only for the R/f converter in order to avoid
decreasing the conversion accuracy due to noise. However, the same voltage level as the V
DD
–V
SS
must
be supplied to the V
DDA
–V
SSA
.
V
DDA
= V
DD
, V
SSA
= V
SS
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