Epson S1D13504 manual Power Save Modes, Hardware Suspend, Software Suspend

Models: S1D13504

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Epson Research and Development

 

Vancouver Design Center

 

 

13 Power Save Modes

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.

13.1Hardware 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 129).

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.

13.2Software Suspend

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 129).

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.

S1D13504

Hardware Functional Specification

X19A-A-002-18

Issue Date: 01/01/30

Page 134
Image 134
Epson S1D13504 manual Power Save Modes, Hardware Suspend, Software Suspend