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181
•
Bits 3–2—DRAM Bus Width Specification (SZ1, SZ0): Specifies the DRAM space bus width.
Bit 3 (SZ1)
Bit 2 (SZ0)
Description
0
0
Byte (8 bits)
(
initial value)
1
Word (16 bits)
1
Don’t care
Longword (32 bits)
•
Bits 1–0—DRAM Address Multiplex (AMX1–AMX0): Specifies the DRAM address
multiplex count.
Bit 1 (AMX1)
Bit 0 (AMX0)
Description
0
0
9 bit
(
initial value)
1
10 bit
1
0
11 bit
1
12 bit
10.2.6
Refresh Timer Control/Status Register (RTCSR)
RTCSR is a 16-bit read/write register that selects the refresh mode and the clock input to the
refresh timer counter (RTCNT), and controls compare match interrupts (CMI).
RTCSR is initialized by power-on resets and hardware standbys to H'0000, but is not initialized by
manual resets or software standbys.
Bit:
15
14
13
12
11
10
9
8
—
—
—
—
—
—
—
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
2
1
0
—
CMF
CMIE
CKS2
CKS1
CKS0
RFSH
RMD
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
•
Bits 15–7—Reserved: These bits always read as 0. The write value should always be 0.
Содержание SH7041 Series
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