S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 65

• Manufacturer Part Number: S1D13704
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
bit 7
bit 3
bit 2
bits 1-0
Hardware Functional Specification
Issue Date: 02/02/01
REG[03h] Mode Register 2
Address = FFE3h
Table Bypass
Look-Up
n/a
Look-Up Table Bypass
When the Look-Up Table Bypass bit = 0, the Green Look-Up Table is used for display
data output in gray shade modes. When this bit = 1, the Look-Up Table is bypassed for dis-
play data output in gray shade modes (for power save purposes). See “Look-Up Table
Architecture” on page 73.
There is no effect on changing this bit in color modes. In color display mode the Look-Up
Table cannot be bypassed.
LCDPWR Override
This bit is used to override the panel on/off sequencing logic. When this bit = 0, LCDPWR
and the panel interface signals are controlled by the sequencing logic. When this bit 1,
LCDPWR is forced to off and the panel interface signals are forced low immediately upon
entering power save mode. See Section 7.3.2, “Power Down/Up Timing” on page 37 for
further information.
Hardware Power Save Enable
When this bit = 1 GPIO0 is used as the Hardware Power Save input pin. When this bit = 0
GPIO0 operates normally.
Software Power Save Bits [1: 0]
These bits select the Power Save Mode as shown in the following table.
Refer to Power Save Modes on page 85 for a complete description.
RESET#
State
0
1
1
1
1
Bit 1
Table 8-6: Software Power Save Mode Selection
0
0
1
1
n/a
Hardware Power
Save Enable
REG[03h] bit 2
X
Table 8-5: Hardware Power Save/GPIO0 Operation
0
0
0
1
Bit 0
0
1
0
1
n/a
GPIO0 Config
REG[18h] bit 0
Software Power Save
LCDPWR
Override
X
X
0
1
1
Normal Operation
reserved
reserved
Mode
reads pin status
Status/Control
Power Save
Hardware
REG[19h] bit 0
Enable
GPIO0
X
X
0
1
Power Save
Software
Bit 1
Hardware Power Save
GPIO0 Operation
GPIO0 Output = 0
GPIO0 Output = 1
Input (active high)
(high impedance)
GPIO0 Input
Read/Write
X26A-A-001-06
Power Save
Software
Bit 0
S1D13704
Page 59