參數(shù)資料
型號： M37920FGCHP
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī))
中文描述： 單片微機(jī)16位的CMOS（16位單片機(jī)）
文件頁數(shù)： 93/158頁
文件大小： 1261K
代理商： M37920FGCHP
93
M37920FCCGP, M37920FCCHP
M37920FGCGP, M37920FGCHP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
Fig. 88 Block diagram of DRAM controller
Table 19. Functions of DRAM-related signals
Table 20. Relationship between external data bus width and multiplexed addresses
Bus Interface Unit (BIU)
Chip select
wait controller
DRAM
control signal
generating circuit
RAS
j
CAS (UCAS/LCAS)
W (WRH/WRL)
MA
0
–
MA
11
DRAM space
designation bit
Address
Refresh request
DRAM control
register
(Address A8
16
)
DRAM controller
Address
multiplexer
Refresh timer
1/ (n + 1)
1/2
DRAM space designation bit: bit 4 at addresses 82
16
, 84
16
, 86
16
j = 1 to 3
b7
b0
1/16
φ
(Address A9
16
)
Valid/Invalid
External data bus width = 16 bits
Multiplexed address output
“
L
”
when a column address at an odd-numbered address is output.
“
L
”
when data at an even-numbered address is written.
“
L
”
when data at an odd-numbered address is written.
“
L
”
when a row address is output.
“
L
”
when a column address at an even-numbered address is output.
External data bus width = 8 bits
“
L
”
when a row address is output.
“
H
”
output (Fixed)
“
L
”
when data is written.
“
H
”
output (Fixed)
Signal
Functions
MA
0
–
MA
11
RAS
j
(j = 1 to 3)
CAS
LCAS
UCAS
WRL
WRH
W
Pin name
External data
bus width = 8 bits
External data
bus width = 16 bits
Row address
Column address
Row address
Column address
O
A
8
/MA
0
A
9
/MA
1
A
10
/MA
2
A
11
/MA
3
A
12
/MA
4
A
13
/MA
5
A
14
/MA
6
A
15
/MA
7
A
16
/MA
8
A
18
/MA
9
A
20
/MA
10
A
22
/MA
11
A
8
A
0
A
8
A
0
: These signals are not used.
A
9
A
1
A
9
A
1
A
10
A
2
A
10
A
2
A
11
A
3
A
11
A
3
A
12
A
4
A
12
A
4
A
13
A
5
A
13
A
5
A
14
A
6
A
14
A
6
A
15
A
7
A
15
A
7
A
16
A
17
A
16
A
8
A
18
A
19
A
18
A
17
A
20
A
21
A
20
A
19
A
22
A
23
A
22
A
21
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