S1D13503 Epson Electronics America, Inc., S1D13503 Datasheet - Page 151

• Manufacturer Part Number: S1D13503
• Description: S1d13503 Graphics Lcd Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
Programming Notes and Examples
Issue Date: 01/01/30
5.6.2.3 Power Save Mode Function Summary
Note
1.
2.
5.6.2.4 Programming to Enter Power Down Mode
If the LCDENB pin is used to control an external LCDBIAS power supply, the following sequence is recommended to
prevent damage to the panel. Panel damage can occur if the LCDBIAS is present without active panel sync signals. Note
the LCDENB pin is controlled by AUX[01h] bit 4 (LCDE).
1.
2.
3.
4.
5.6.2.5 Programming to Exit Power Down Mode
When the LCDENB pin is used to control an external LCDBIAS power supply, the following sequence is recommended
to exit power down mode. Note the LCDENB pin is controlled by AUX[01h] bit 4 (LCDE).
1.
2.
3.
Write ‘0’ to bit 7 of AUX[01h] to turn off the display.
Write to bit 4 of AUX[01h] with value 'x' as appropriate to disable the specific power supply design. For the
S5U13503B00C, write ‘0’ to disable the power supply.
Wait until the LCDBIAS power supply reaches zero volts. This delay time is dependent upon the specific power sup-
ply design, as well as the display’s electrical characteristics. For the S5U13503B00C, this time is about 0.5 seconds.
Enter power saving mode by writing the appropriate bits 7-6 of AUX[03h].
Exit power saving mode by writing 00b to bits 7-6 of AUX[03h].
Write to bit 4 of AUX[01h] with value 'x' as appropriate to enable the specific power supply design. For the
S5U13503B00C, write ‘1’ to enable the power supply. Note that no delay is required before applying power.
Write ‘1’ to bit 7 of AUX[01h] to turn on the display.
When programming the PS bits perform a read/modify/write operation so as not to destroy any
other data in the register.
Refer to the programming example in Advanced Functions on page 66.
Sequence Controller Running?
Internal Oscillator Disabled?
Memory Access Possible?
I/O Access Possible?
Display Active?
Function
Table 5-4: Power Save Mode Function Summary
(Active)
Normal
Yes
Yes
Yes
Yes
No
Power Save Mode (PSM)
State 1
Yes
Yes
No
No
No
PSM1
State 2
Yes
No
No
No
No
PSM2
Yes
Yes
No
No
No
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S1D13503
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