參數(shù)資料
型號: M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機
文件頁數(shù): 77/172頁
文件大?。?/td> 1193K
代理商: M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Master CPU Bus Interface
7/9/98
2-65
2.10 Master CPU Bus Interface
This device has a bus interface function with 2 I/O buffers that can be operated in slave mode by
control signals from the master CPU (see Figure 2-87. Bus Interface Circuit). The bus interface can
be connected directly to either a R/W type of CPU or a CPU with RD and WR separate signals. Slave
mode is selected with the bit 7 of the data buffer control register 0. The single data bus buffer mode
and the double data bus buffer mode are selected with bit 7 of the data bus buffer control register 1.
When selecting the double data bus buffer mode, port P7
2
becomes S
1
input. Prior to enabling the
MBI, port 6 must be placed in input mode by writing 00
16
to P6D (0015
16
).
Figure 2-87. Bus Interface Circuit
When data is written to the MCU from the master CPU, an input buffer full interrupt request occurs.
Similarly, when data is read from the master CPU, an output buffer empty interrupt request occurs.
Address
Description
Acronym and
Value at Reset
0048
16
0049
16
004A
16
004C
16
004D
16
004E
16
Data bus buffer register 0
Data bus buffer status register 0
Data bus buffer control register 0 DBBC0=00
Data bus buffer register 1
Data bus buffer status register 1
Data bus buffer control register 1 DBBC1=00
DBB0=00
DBBS0=00
DBB1=00
DBBS1=00
Pin
Description
Pin
Description
P6
0
-P6
7
are multiplexed with DQ0-DQ7
P5
2
is multiplexed with OBF
0
P5
3
is multiplexed with IBF
0
P5
4
is multiplexed with S
0
P5
5
is multiplexed with A
0
P5
6
P5
7
P7
2
P7
3
P7
4
is multiplexed with R or E
is multiplexed with W or R/W
is multiplexed with S
1
is multiplexed with IBF
1
is multiplexed with OBF
1
Data Bus
I
O
U
7
U
6
U
5
U
4
A
00
U
2
IBF
0
b
7
b
0
System Bus
OBF
0
b
1
b
0
D
OBF
0
IBF
0
A
0
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
S
0
R
W
RD
WR
0
DBBS
0
I
O
U
7
U
6
U
5
U
4
A
01
U
2
IBF
1
b
7
b
0
OBF
1
b
1
b
0
D
OBF
1
IBF
1
A
0
S
1
R
W
RD
WR
1
DBBS
1
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