SH7764 Datasheet, PDF (1296/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 24 Video Display Controller (VDC2)
Table 24.8 Functions of Display Enable Bits
DEN VEN Operation
Output
Control
0
0
Does not read image data Outputs the color specified in
from memory or process GROPBASERGB over the
lower-layer graphics
entire screen (negates the
display.
enable signal output).
0
1
Does not read image data Outputs only the lower-layer Displays only the lower-
from memory but
graphics (outputs the lower- layer graphics.
processes lower-layer
layer graphics enable signal)
graphics display.
1
0
Reads image data from Outputs only the current
Displays only the current
memory but does not
graphics (outputs the current graphics.
process lower-layer
graphics enable signal).
graphics display.
1
1
Reads image data from Performs the specified
Displays the current and
memory and processes processing for the current lower-layer graphics.
lower-layer graphics
graphics and lower-layer
display.
graphics and displays them
(logically ORs the current
graphics and lower-layer
graphics enable signals and
outputs the result).
Notes: 1. When the α control area (specified by GROPEW and GROPEDPHV) is larger than the
graphic image area (specified by GROPSWH and GROPDPHV), only the lower-layer
graphic images are displayed.
2. These bits should be set for each layer. When (DEN,VEN) = (0,0) in the upper layer, the
graphics in the lower layers are not output.
Rev. 1.00 Nov. 22, 2007 Page 1240 of 1692
REJ09B0360-0100