S1D13705F00A200 Epson, S1D13705F00A200 Datasheet - Page 111

• Manufacturer Part Number: S1D13705F00A200
• Manufacturer: Epson

Specifications of S1D13705F00A200

• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: TQFP
• Pin Count: 80
• Mounting: Surface Mount
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Compliant

7: HARDWARE ROTATION
7.3 Alternate SwivelView Mode
2-26
physical
memory
address
start
Figure 7-2 Relationship Between the Alternate Mode Screen Image and the Image Refreshed by S1D13705
Alternate SwivelView mode does not impose the power of two line width. To rotated the image on
240 line panel requires a portrait stride of 240 pixels. Alternate SwivelView mode is capable of
scrolling by one line at a time in response to changes to the Start Address Registers. However, to
achieve the same frame rate requires a 2 x faster input clock, therefore using more power.
The following figure depicts the ways to envision memory layouts for the S1D13705 in alternate
SwivelView mode. This example also uses a 480 320 panel. Notice that in alternate SwivelView
mode the stride may be as little as 240 pixels.
From the programmers perspective the memory is laid out as shown on the left. The programmer
accesses memory exactly as for a panel of with the dimensions of 480 320. The programmer sees
memory addresses increasing from A->B and from C->D.
From a hardware perspective the S1D13705 always refreshes the LCD panel in the order B->D and
down to do A->C
The greatest factor in selecting alternate SwivelView mode over default SwivelView mode would be
for the ability to obtain an area of contiguous off screen memory. For example: A 640 480 panel in
default SwivelView mode at two bit-per-pixel requires 81920 bytes (80 Kb). There is unused
memory but it is not contiguous. The same situation using alternate SwivelView mode requires
76800 bytes leaving 5120 bytes of contiguous memory available to the application. In fact the
change in memory usage may make the difference between being able to run certain panels in
SwivelView mode or not being able to do so.
image seen by programmer
= image in display buffer
C
A
SwivelView
window
320
D
B
EPSON
display
address
start
image refreshed by S1D13705
S1D13705F00A PROGRAMMING NOTES
AND EXAMPLES (X27A-G-002-01)
480