SED1374 Datasheet, PDF (188/420 Pages) Epson Company – SED1374 Embedded Memory Color LCD Controller

Page 10
Miscellaneous Options
Epson Research and Development
Vancouver Design Center
Figure 3: Miscellaneous Options
Miscellaneous options are several items which do not fit into any other category.
• HW Video Invert Enable - the SED1374 supports inverted color output. The color
inversion can be toggled by software or in response to a signal applied to pin FPDAT11.
In order for the hardware color inversion to succeed this option must be selected.
- The color inversion is performed on the output from the LUT.
- HW Video Invert is not availlable for TFT operation.
• HW Power Save Enable - the SED1374 supports two power save modes. One is initi-
ated by software, the second in response to input on the GPIO0 pin. In order for the
hardware power save mode to function this option must be selected.
• High Performance - improves chip throughput at the expense of power consumption.
When not selected the internal MCLK signal is divided down version of the internal
PCLK signal. Table 1 depicts the ratios when high performance is not selected. The
slower MCLKs result in lower power use.
Table 1: MCLK to PCLK ratios
Color Depth (bpp)
1
2
4
8
Ratio
MCLK = PCLK / 8
MCLK = PCLK / 4
MCLK = PCLK / 2
MCLK = PCLK
When this option is selected MCLK == PCLCK at all pixel depths. Running MCLK at
higher frequencies results in greater power use.
SED1374
X26A-B-001-01
1374CFG.EXE Configuration Program
Issue Date: 98/10/27