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): 78/172頁
文件大?。?/td> 1193K
代理商: M37640E8
2-66
7/9/98
Master CPU Bus Interface
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
When the bus interface is operating, DQ
0
-DQ
7
become a 3-state data bus that sends and receives data,
command, and status to and from the master CPU. At the same time, W, R, S
0
, S
1
, and A
0
become
host CPU control signal input pins.
The two input buffer full interrupt requests and two output buffer full requests are multiplexed as
shown in Figure 2-88.
The bus interface can be operated under normal MCU control or under on-chip DMA control for fast
data transfer. If a master CPU has a large amount of data to be transferred, use of the on-chip DMA
controller is highly recommended.
The bus interface signal input level can be programmed as CMOS level (default) or as TTL level.
Bit 7 of the Port Control Register (PTC7) is used for the input level selection.
Figure 2-88. Data Bus Buffer Interrupt Request Circuit
Figure 2-89. Data Bus Buffer Status Register 0
One-shot pulse
One-shot pulse
One-shot pulse
One-shot pulse
Rising Edge
Rising Edge
Rising Edge
Rising Edge
Input Buffer full interrupt
request signal IBF
Output Buffer Empty interrupt
request signal OBE
Input buffer full flag 0
IBF0
Input buffer full flag 1
IBF1
Output buffer full flag 0
OBF0
Output buffer full flag 1
OBF1
Set interrupt request at this rising edge
Set interrupt request at this rising edge
IBF0
IBF1
IBF
OBF1
(OBE1)
OBE
OBF0
(OBE0)
DBBS00
Output Buffer Full (OBF
0
) Flag (bit 0)
0: Output buffer empty.
1: Output buffer full.
Input Buffer Full (IBF
) Flag (bit 1)
0: Input buffer empty.
1: Input buffer full.
User Definable (U2) Flag (bit 2)
A
0
(A
) Flag (bit 3)
Indicates the A
status when IBF flag is set
User Definable (U4) Flag (bit 4)
User Definable (U5) Flag (bit 5)
User Definable (U6) Flag (bit 6)
User Definable (U7) Flag (bit 7)
DBBS01
DBBS02
DBBS03
DBBS04
DBBS05
DBBS06
DBBS07
MSB
7
LSB
0
DBBS06
DBB05
DBBS04
DBBS03
DBBS01
DBBS00
Access: R/W
Reset: 00
16
DBBS02
DBBS07
Address: 0049
16
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