S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 117
S1D13505
Manufacturer Part Number
S1D13505
Description
LCD Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13505.pdf
(566 pages)
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bit 3
bits 2-1
bit 0
8.2.7 Miscellaneous Registers
bit 7
bit 0
Hardware Functional Specification
Issue Date: 01/02/02
Miscellaneous Register
REG[1Bh]
Host Interface
Disable
n/a
Suspend Refresh Select Bits [1:0]
Note
LCD Power Disable
This bit is used to override the panel on/off sequencing logic.
When this bit = 0 the LCDPWR output is controlled by the panel on/off sequencing logic.
When this bit = 1 the LCDPWR output is directly forced to the off state.
The LCDPWR “On/Off” polarity is configured by MD10 at the rising edge of RESET# (MD10 = 0
configures LCDPWR = 0 as the Off state; MD10 = 1 configures LCDPWR = 1 as the Off state).
Suspend Refresh Select Bits [1:0]
These bits specify the type of DRAM refresh to use in Suspend mode.
Software Suspend Mode Enable
When this bit = 1 software Suspend mode is enabled.
When this bit = 0 software Suspend mode is disabled.
See Section 15 Power Save Modes for details.
Host Interface Disable
This bit is set to 1 during power-on/reset.
This bit must be programmed to 0 to enable the Host Interface. When this bit is high, all memory
and all registers except REG[1Ah] (read-only) and REG[1Bh] are inaccessible.
Half Frame Buffer Disable
This bit is used to disable the Half Frame Buffer.
When this bit = 1, the Half Frame Buffer is disabled.
When this bit = 0, the Half Frame Buffer is enabled.
When a single panel is selected, the Half Frame Buffer is automatically disabled and this bit has no
effect.
The half frame buffer is needed to fully support dual panels. Disabling the Half Frame Buffer
reduces memory bandwidth requirements and increases the supportable pixel clock frequency, but
results in reduced contrast on the LCD panel (the duty cycle of the LCD is halved). This mode is
not normally used except under special circumstances such as simultaneous display on a CRT and
dual panel LCD. When this mode is used the Alternate Frame Rate Modulation scheme should be
used (see REG[31h]). For details on Frame Rate calculation see Section 14.2, “Frame Rate Calcu-
lation” on page 141.
These bits should not be changed while suspend mode is active.
n/a
1X
00
01
Table 8-10: Suspend Refresh Selection
n/a
n/a
CAS-before-RAS (CBR) refresh
DRAM Refresh Type
n/a
Self-Refresh
No Refresh
n/a
Half Frame
Buffer Disable
X23A-A-001-14
S1D13505
Page 111
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