
Page 44
Epson Research and Development
Vancouver Design Center
SED1352
Programming Notes and Examples
X16-BG-007-04
Issue Date: 98/10/08
5.6 Power Saving
The following section introduces the power saving capabilities of the SED1352. A detailed description of the Power Save
Register is provided, followed by a description of the power save modes.
5.6.1 Registers
Note
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 to 0 on RESET.
Refer to Section 5.6.2, “Power Save Modes” on page 44 for a complete Power Save Mode description.
5.6.2 Power Save Modes
Two software-controlled Power Save Modes have been incorporated into the SED1352 to accommodate the important need
for power reduction in 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 memory accesses may occur. The disad-
vantage 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 memory accesses would not occur.
AUX[03] Line Byte Count (MSB [bit 8] for 16-level gray scale mode only) / Power Save Register
I/O address = 0011b, Read/Write
PS
Bit 1
PS
Bit 0
LCD Signal
State
LUT
Bypass
n/a
n/a
n/a
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