CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
142
5.3.5 DRAM type configuration register (DTC)
This controls the relationship between DRAM configuration register n (DRCn) and memory block m (n = 0 to 3, m =
0 to 7).
These registers can be read/written in 16-bit units.
15
DC
71
DTC
Memory
block
Address
FFFFF220H
After reset
0000H
14
DC
70
13
DC
61
12
DC
60
11
DC
51
10
DC
50
9
DC
41
8
DC
40
7
DC
31
6
DC
30
5
DC
21
4
DC
20
3
DC
11
2
DC
10
1
DC
01
0
DC
00
7
6
5
4
3
2
1
0
Bit Position
Bit Name
Function
DRAM Type Configuration
Specifies the DRAM configuration register n (DRCn) corresponding to memory block m.
Furthermore, it has no meaning if the memory block m is not specified in the DRAM
area.
DCm1
DCm0
DRAM Configuration Register n (DRCn) Corresponding
to Memory Block m
0
0
DRC0
0
1
DRC1
1
0
DRC2
1
1
DRC3
15 to 0
DCm1,
DCm0
Caution Write to the DTC register after reset, and then do not change the set value. Also, do not access
an external memory area other than the one for this initialization routine until the initial setting
of the DTC register is complete. However, it is possible to access an external memory area
whose initialization is complete.
Remark
n = 0 to 3
m = 0 to 7
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