S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 406

• Manufacturer Part Number: S1D1
• Description: LCD Controller-driver With Built-in Character ROM
• Manufacturer: Epson Electronics America, Inc.

Rev. 3.1a
(20) Power Save
This command makes the static indicator enter the power save state and can greatly reduce the power consumption. The
power save state consists of the sleep state and stand-by state.
The operating state before the display data and power save activation is held in the sleep and stand-by states, and the
display data RAM can also be accessed from the MPU.
• Sleep State
This command stops all the operations of LCD display systems, and can reduce the power consumption approximate
to the static current when they are not accessed from the MPU. The internal state in the sleep state is as follows:
(1) The oscillator circuit and the LCD power supply circuit are stopped.
(2) All liquid crystal drive circuit is stopped and the segment and common drivers output the V
• Stand-by State
This command stops the operation of the duty LCD display system and operates only the static drive system for
indicators. Consequently the minimum current consumption required for the static drive is obtained. The internal state
in the stand-by state is as follows:
(1) The LCD power supply circuit is stopped. The oscillator circuit is operated.
(2) The duty drive system liquid crystal drive circuit is stopped and the segment and common drivers output the V
(21) Power Save Reset
This command resets the power save state and returns the state before power save activation.
(22) n-Line Reversal Drive Register Set
This command sets the number of reversal lines of the liquid crystal drive in the register. 2 to 16 lines can be set. For
details, see the Display Timing Generator Circuit of “Function Description”.
A0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
A0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
A0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
level. The static drive system is operated.
* When using external power supplies, it is recommended that the function of the external power supply circuit
E R/W
1
E R/W
1
E R/W
1
should be stopped at power save activation. For example, when providing each level of the liquid crystal drive
voltage using a stand-alone split resistor circuit, it is recommended that the circuit which cuts off the current
applied to the split resistor circuit should be added at power save activation. The S1D15705 series has the liquid
crystal display blanking control pin DOF and is set to LOW at power save activation. The function of the
external power supply circuit can be stopped using the DOF output.
0
0
0
1
1
0
0
1
0
1
1
1
0
0
1
1
0
0
0
0
1
1
0
0
0
0
0
1
1
0
0
0
0
1
1
1
EPSON
0
1
1
0
1
0
0
1
Power save state
Stand-by state
Sleep state
Line of reversal lines
15
16
—
2
3
S1D15705 Series
DD
level.
10–47
DD