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Epson Research and Development
Vancouver Design Center
S1D13503
Programming Notes and Examples
X18A-G-002-06
Issue Date: 01/01/30
5.6 Power Saving
The following section introduces the power saving capabilities of the S1D13503. A detailed description of the Power Save
Register is provided, followed by a description of the power save modes.
5.6.1 Registers
Register bits discussed in this section are highlighted.
bits 7-6
PS Bits [1:0]
Selects the Power Save Modes as shown in the following table. The PS bits [1:0] go low on RESET.
For more details refer to “Power Save Modes” in the S1D13503 Hardware Functional Specification, Draw-
ing Office No. X18A-A-001-xx.
5.6.2 Power Save Modes
Two software-controlled Power Save Modes have been incorporated into the S1D13503 to accommodate the important
need for power reduction in the hand-held devices market. These modes can be enabled by setting the 2 Power Save bits
(AUX[03h] bits 7-6).
The various settings are:
5.6.2.1 Power Save Mode 1
Power Save Mode 1 would typically be used when power savings are required and display memory accesses may occur.
The disadvantage is that since the oscillator is running, this mode consumes more power that Power Save Mode 2.
5.6.2.2 Power Save Mode 2
Power Save Mode 2 is typically used when display memory accesses would not occur.
AUX[03] Mode Register 1
I/O address = 0011b, Read/Write
PS
Bit 1
PS
Bit 0
LCD Signal
State
LUT
Bypass
LCD Data
Width Bit 1
BW /
256 colors
Color Mode
Line Byte
Count Bit 8
Table 5-2: Power Save Mode Selection
PS1
PS0
Mode Activated
0
0
Normal Operation
0
1
Power Save Mode 1
1
0
Power Save Mode 2
1
1
Reserved
Table 5-3: Power Save Mode Selection
Bit 7 Bit 6
Mode Activated
0
0
Normal Operation
0
1
Power Save Mode 1
1
0
Power Save Mode 2
1
1
Reserved
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