Renesas SH7781 - Manual (Page 985)

19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 955 of 1658
REJ09B0261-0100
TV (sync signal generation circuit): Master
Clock HSYNC VSYNC R,G,B
This LSI: Slave
DCLKIN DR5-DR0
DG5-DG0
DB5-DB0
Input 2
Input 1
Output
Display
Switching between master
(input 2) and slave (input 1)
by CDE.
VSYNC ODDF
CDE
HSYNC
Field signal
Figure 19.12 Signal Flow in TV Sync Mode
Sync Method Switching Mode: When switching from master mode into TV sync mode, or from
TV sync mode into master mode, when necessary this mode should be switched into first. Even if
a transition to this mode is not made first, switching of the synchronization method is possible.
In this mode, input/output pins connected to the display unit (DU) are for input, and so pin
collision can be avoided. Also, in this mode no display operation is performed, and the internal dot
clock is stopped, so that disorder in the input dot clock has no effect on display operation.