SED1374 Datasheet, PDF (92/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Page 84
Epson Research and Development
Vancouver Design Center
13 Power Save Modes
Two Power Save Modes have been incorporated into the SED1374 to accommodate the
need for power reduction in the hand-held devices market. These modes are enabled as
follows:
Table 13-1: Power Save Mode Selection
Hardware Power
Save
Not Configured or 0
Not Configured or 0
Not Configured or 0
Not Configured or 0
Configured and 1
Software Power
Save Bit 1
0
0
1
1
X
Software Power
Save Bit 0
0
1
0
1
X
Mode
Software Power Save Mode
reserved
reserved
Normal Operation
Hardware Power Save Mode
13.1 Software Power Save Mode
Software Power Save Mode saves power by powering down the panel and stopping display
refresh accesses to the display buffer.
Table 13-2: Software Power Save Mode Summary
• Registers read/write accessible
• Memory read/write accessible
• LCD outputs are forced low
13.2 Hardware Power Save Mode
Hardware Power Save Mode saves power by powering down the panel, stopping accesses
to the display buffer and registers, and disabling the Host Bus Interface.
Table 13-3: Hardware Power Save Mode Summary
• Host Interface not accessible
• Memory read/write not accessible
• LCD outputs are forced low
SED1374
X26A-A-001-02
Hardware Functional Specification
Issue Date: 99/04/29