Renesas R61509V - Manual (Page 98)

R61509V Target Spec
Rev. 0.11 April 25, 2008, page 98 of 181
RGB interface operation (2)
This mode enables the R61509V to rewrite RAM data via system interface while using RGB interface for
display operation. To rewrite RAM data via system interface, make sure that display data is not transferred
via RGB interface (ENABLE = high). To return to the RGB interface operation, change the ENABLE
setting first. Then set an address in the RAM address set register and R22h in the index register.
VSYNC interface operation
The internal display operation is synchronized with the frame synchronous signal (VSYNCX) in this mode.
This mode enables the R61509V to display a moving picture via system interface by writing data in the
internal RAM at faster than the calculated minimum speed via system interface from the falling edge of
frame synchronous (VSYNCX). In this case, there are restrictions in speed and method of writing RAM
data. For details, see the “VSYNC Interface” section.
As external input, only VSYNCX signal input is valid in this mode. Other input via external display
interface becomes disabled.
The front porch (FP), back porch (BP), and the display (NL) periods are automatically calculated from the
frame synchronous signal (VSYNCX) inside the R61509V according to the instruction settings for these
periods.
FMARK interface operation
In the FMARK interface operation, data is written to internal RAM via system interface synchronizing with
the frame mark signal (FMARK), realizing tearing-less moving picture while using conventional system
interface. In this case, there are restrictions in speed and method of writing RAM data. See “FMARK
interface” for detail.