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Epson Research and Development
Vancouver Design Center
13 Power Save Modes
13.1 Hardware Suspend
13.2 Software Suspend
Hardware Functional Specification
Issue Date: 01/11/06
Two Power Save Modes have been incorporated into the S1D13504 to accommodate the important
need for power reduction in the hand-held devices market. These modes are hardware suspend and
software suspend.
• Register read/write disallowed.
• Memory read/write disallowed.
• LCD outputs are forced low (see Note 1 of Section 13.4, "Pin States in Power Save Modes" on
page 128).
• LCDPWR forced to Off state.
• CRT outputs are disabled.
• If suspend mode CBR refresh is selected, all internal modules and clocks except the Memory I/F
are shut down.
• If suspend mode self-refresh or no-refresh is selected, all internal modules and clocks are shut
down.
• Register read/write allowed except for RAMDAC registers.
• Memory read/write disallowed.
• LCD outputs are forced low (see Note 1 of Section 13.4, "Pin States in Power Save Modes" on
page 128).
• LCDPWR forced to Off state.
• CRT outputs are disabled.
• If suspend mode CBR refresh is selected, all internal modules and clocks except the Host Bus I/F
and the Memory I/F are shut down.
• If suspend mode self-refresh or no-refresh is selected, all internal modules and clocks except the
Host Bus I/F are shut down.
Page 127
S1D13504
X19A-A-002-19
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