Renesas SH7781 - Manual (Page 979)

19. Display Unit (DU)
Rev.1.00 Jan. 10, 2008 Page 949 of 1658
REJ09B0261-0100
Plane Priority Order: The display priority order for planes is set using DPPR; if one plane is set
in two or more places in the priority order, the place with highest priority is selected.
For example, if the setting in DPPR is H'00CBD888, then the results of the priority order and
display on/off settings are as follows.
Plane with priority 1 Plane 1
Plane with priority 2 No corresponding plane
Plane with priority 3 No corresponding plane
Plane with priority 4 Plane 6
Plane with priority 5 Plane 4
Plane with priority 6 Plane 5
Display off planes Plane 2 and plane 3
19.4.11 Blinking
For each plane, blinking operation can be performed by using the display area start address 0 and
1 registers.
Usually, double buffer control is performed for each plane according to the setting of the PnBM
bit in PnMR. However, blinking is performed with the period specified by the PnBTA and PnBTB
bits in PnBTR by setting the PnBM bits in PnMR to 10 (Auto display change mode (blinking
mode)). If the PnBTA and PnBTB bits are set to 0, operation is the same as when set to 1.
(m-1)th frame m-th frame First frame Second frame
VSYNC
Operation of
the display unit (DU)
A0 is displayed on screen A1 is displayed on screen
A0: Display area start address 0
A1: Display area start address 1
PnBTA (A0 display period is set)
PnBTB (A1 display period is set)
(Internal counter)
Blinking period
setting
BTA-1 BTA 0 1
Buffer switching performed
according to blinking period