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S1D13505 Programming Notes and Examples
X23A-G-003-07 Issue Date: 01/02/05
Delay Too Long
To shorten 128 frame delay on LCDPWR.
1. Set REG[23h] bit 7 to 1 - Blanks screen by disabling the FIFO.
2. Set REG[04h] to 3 (changes display width to 32 pixels)
Set REG[08h] to 0 (changes display height to 1 line)
- This changes the display resolution to minimum (32x1).
3. Set REG[1Ah] bit 0 to 0 - Enables power save mode.
4. Wait delay time (based on new frame rate, see S1D13505 Hardware Functional Spec-
ification, document number X23A-A-001-xx)
- at this time any clocks can be disabled.
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5. Enable any clocks that were disabled in step 4.
6. Set REG[1Ah] bit 0 to 0 - Disables power save mode.
7. Set REG[04h] to original setting
Set REG[08h] to original setting
- Re-initializes the original resolution.
8. Set REG[023h] bit 7 to 0 - Un-blanks screen by enabling the FIFO.
6.2 Software Power Save
The S1D13505 supports a software initiated suspend power save mode. This mode is
controllable using the Software Suspend Mode Enable bit in REG[1Ah]. The type of
memory refresh used during suspend can also be controlled by software.
While software suspend is enabled the following conditions apply.
display(s) are inactive
registers are accessible
memory is not-accessible
LUT is accessible