Renesas SH7781 - Manual (Page 997)

19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 967 of 1658
REJ09B0261-0100
19.5.6 CLAMP Signal and DE Signal
The display unit (DU) generates a CLAMP signal and DE signal, independent of the DISP signal
indicating the display interval.
The rising-edge start position and high-level width of the CLAMP signal and DE signal, with
reference to the HSYNC signal falling edge, can be set in dot clock units. Figure 19.20 shows the
timing chart.
However, the DE signal is fixed at low level during the vertical blanking interval.
DCLKOUT
(output)
HSYNC signal
CLAMP signal/
DE signal
CLAMP signal/
DE signal
CLAMP signal/
DE signal
Starting position value
+ 1 High-level width value
The minimum value of rising position = 1
Start position value
+ 1 High-level width value
When the HSYNC
signal falls, the
CLAMP signal/DE
signal also falls.
When start position value is 0
When (start position value + high-level width value) exceeds the HSYNC period
Figure 19.20 CLAMP Signal and DE Signal