1 ga mask register (gacmr) – Renesas SH7781 User Manual
Page 1009
20. Graphics Data Translation Accelerator (GDTA)
Rev.1.00 Jan. 10, 2008 Page 979 of 1658
REJ09B0261-0100
20.3.1
GA Mask Register (GACMR)
GACMR is in the GDTA common register block and enables writing to the GA enable register
(GACER). Writing to GACER is enabled by writing of the key code to this register. In the initial
state, the key code is not written and writing to GACER is disabled.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
31
30
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GACM
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BIt:
Initial value:
R/W:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GACM
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BIt:
Initial value:
R/W:
Bit Bit
Name
Initial
Value R/W Description
31 to 0 GACM
0
R/W
Write the key code [H'A55A 0FF0] to enable writing to
GACER. If a value other than the key code is written,
writing to the GA enable register is disabled.