
KS0724 PRELIMINARY SPEC. VER. 0.8 65 COM / 132 SEG DRIVER & CONTROLLER FOR STN LCD
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Power Save (Compound Instruction)
If the entire display ON / OFF instruction is issued during the display OFF state, KS0724 enters the Power
Save status to reduce the power consumption to the static power consumption value. According to the status
of static indicator mode, Power Save is entered to one mode of sleep and standby mode. When Static
Indicator mode is ON, standby mode is issued. When OFF, sleep mode is issued. Power Save mode is
released by the entire display OFF instruction.
Sleep Mode
[Oscillator Circuit: OFF]
[LCD Power Supply Circuit: OFF]
[All COM / SEG Outputs: VSS]
[Consumption Current: <2uA]
Power Save OFF (Compound Instruction)
[Entire Display OFF]
[Static Indicator ON]
2 Bytes Command
Power Save (Compound Instruction)
[Display OFF]
[Entire Display ON]
Static Indicator OFF
Static Indicator ON
Standby Mode
[Oscillator Circuit: ON]
[LCD Power Supply Circuit: OFF]
[All COM / SEG Outputs: VSS]
[Consumption Current: <10uA]
Power Save OFF
[Entire Display OFF]
Release Sleep Mode
Release Standby Mode
Figure 25. Power Save (Compound Instruction)
Sleep Mode
This stops all operations in the LCD display system, and as long as there are no access from the MPU, the
consumption current is reduced to a value near the static current. The internal modes during sleep mode
are as follows:
a. The oscillator circuit and the LCD power supply circuit are halted.
b. All liquid crystal drive circuits are halted, and the segment in common drive outputs output a V
SS
level.
Standby Mode
The duty LCD display system operations are halted and only the static drive system for the indicator
continues to operate, providing the minimum required consumption current for the static drive.
The internal modes are in the following states during standby mode.
a. The LCD power supply circuits are halted. The oscillator circuit continues to operate.
b. The duty drive system liquid crystal drive circuits are halted and the segment and common driver outputs
a V
SS
level. The static drive system does not operate.
When a reset command is performed while in standby mode, the system enters sleep mode.