SH7764 Datasheet, PDF (1266/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 23 G2D
the local offset. The upper word indicates the maximum value of the relative user clipping X
coordinate (RUXMAX) and the lower word indicates the maximum value of the relative user
clipping Y coordinate (RUYMAX). The unused bits are always read as 0. When setting this
register by the WPR command, set RUXMAX and RUYMAX in the following ranges: 0 ≤
RUXMIN ≤ RUXMAX ≤ SXMAX ≤ 4095, 0 ≤ RUYMIN ≤ RUYMAX ≤ SYMAX ≤ 4095. For
details on the setting ranges, see (5) Relative Clipping Specification (RCLIP), in section 23.1.5,
Rendering Attributes.
RUCLMAR retains its value at a reset.
(10) Rendering Control 2 Register (RCL2R)
Offset:
H'0F0
Initial Value: H'00004004
The rendering control 2 register (RCL2R) is a 32-bit readable/writable register which specifies the
rendering attributes.
Bit 21—Destination Alpha Enable (DAE): This bit is used in combination with the alpha blend
enable (αE) bit. With the ARGB = 1555 format, only the pixels whose destination (ground) A
value is 1 are alpha blended. Pixels whose destination (ground) A value is 0 are not drawn.
Bit 21: DAE Description
0
Alpha blending is performed regardless of the destination (ground) A value (Initial
value)
1
Alpha blending is performed for only the pixels whose destination (ground) A value
is 1
Notes: 1. Clear this bit to 0 for the RGB = 565 format or at 8-bit-pixel drawing.
2. Clear this bit to 0 for commands other than the POLYGON4 type commands.
3. Clear this bit to 0 when the alpha blend enable bit (αE) is 0.
4. This bit is not decoded by a command so it must be set or cleared in each relevant
command.
Bit 20—Pattern Style Enable (PSTYLE): This bit is used in combination with the source style
specification (STYLE). The source pattern is created repeatedly in the pattern size based on the
destination coordinates.
Rev. 1.00 Nov. 22, 2007 Page 1210 of 1692
REJ09B0360-0100