SED1374 Datasheet, PDF (137/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Epson Research and Development
Vancouver Design Center
Page 41
7.5 Limitations
The only limitation to using SwivelView mode on the SED1374 is that split screen
operation is not supported.
A comparison of the two SwivelView modes is as follows:
Table 7-1: Default and Alternate SwivelView Mode Comparison
Item
Default SwivelView Mode
Alternate SwivelView Mode
Memory Requirements
The width of the rotated image must be a
power of 2. In most cases, a virtual image is
required where the right-hand side of the
virtual image is unused and memory is
wasted. For example, a 160x240x8bpp
image would normally require only 38,400
Does not require a virtual image.
bytes - possible within the 40K byte
address space, but the virtual image is
256x240x8bpp which needs 61,440 bytes -
not possible.
Clock Requirements
CLK need only be as fast as the required
PCLK.
MCLK, and hence CLK, need to be 2x PCLK.
For example, if the panel requires a 3MHz
PCLK, then CLK must be 6MHz. Note that
25MHz is the maximum CLK, so PCLK cannot
be higher than 12.5MHz in this mode.
Power Consumption Lowest power consumption.
Typically 20% higher than Default Mode.
Panning
Vertical panning in 2-line increments.
Vertical panning in 1-line increments.
Performance
Nominal performance.
Slightly higher performance than Default Mode.
Programming Notes and Examples
Issue Date: 99/04/27
SED1374
X26A-G-002-02