S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 133

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

Epson Research and Development
Vancouver Design Center
7.3 Alternate SwivelView Mode
Programming Notes and Examples
Issue Date: 01/02/12
physical
memory
address
start
Figure 7-1: Relationship Between The Screen Image and the Image Refreshed by S1D13704
image seen by programmer
= image in display buffer
C
A
SwivelView
window
The following figures show how the programmer sees a 240x320 image and how the image
is displayed. The application image is written to the S1D13704 in the following sense:
A–B–C–D. The display is refreshed by the S1D13704 in the following sense: B-D-A-C.
Alternate SwivelView Mode may be used when the virtual image size of Default
SwivelView Mode cannot be contained in the 40k Byte integrated frame buffer. For
example, when the panel size is 240x160 and the display mode is 8 bit-per-pixel the
minimum virtual image size for Default SwivelView Mode would be 240x256 which
requires 60K bytes. Alternate SwivelView Mode requires a panel size of only 240x160
which needs only 38,400 bytes.
Alternate SwivelView Mode requires the memory clock (MCLK) to be at least twice the
frequency of the pixel clock (PCLK), i.e. MCLK
Because of this, the power consumption in Alternate SwivelView Mode is higher than in
Default SwivelView Mode.
The following figure shows how the programmer sees a 240x160 image and how the image
is being displayed. The application image is written to the S1D13704 in the following
sense: A–B–C–D. The display is refreshed by the S1D13704 in the following sense: B-D-
A-C.
240
256
D
B
E
display
address
start
image refreshed by S1D13704
2 x PCLK.
320
X26A-G-002-03
S1D13704
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