參數(shù)資料
型號(hào): 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(jī)
文件頁數(shù): 30/172頁
文件大?。?/td> 1193K
代理商: M37640E8
2-18
7/9/98
Processor Modes
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
2.5.2
Memory Expansion
In this mode, Ports 0 and 1 output the address bus (AB
0
-AB
15
), port 2 acts as the data bus input and
output, and port 3 bits 7 to 3 output RD, WR, SYNCout,
Φ
out, and DMAout, respectively. All
memory areas that are not internal memory or SFR area are accessed externally. Because ports 0 to 3
lose their normal function in this mode, the address area for the ports and their direction registers are
treated as external memory (see Figure 2-15.) In this mode, slow memory wait and EDMA can be
enabled.
2.5.3
Microprocessor
This mode is primarily the same as memory expansion mode. The difference is that the internal
ROM / EPROM area can not be accessed and is instead treated as external memory. Slow memory
wait and EDMA can be enabled in this mode.
2.5.4
EPROM
This mode is used for programming and testing the internal EPROM. In this mode, ports 0 and 1
input the address, port 2 acts as the data bus input and output, and port 3 bits 7, 6, 3 and 2 input
OEB, CEB, PGMB, and VRFY, respectively.
Figure 2-16. Function of Ports P
0
-P
3
in each Processor Mode
CPMA1
CPMA0
Port P0
0
0
0
1
1
0
Port P1
Port P2
Port P3
Mode
Port
Single Chip Mode
Internal
Microprocessor Mode
Internal
Memory Expansion Mode
Φ
Φ
Port P0
7
- P0
0
I/O Port
Port P0
7
- P0
0
Address
Output
AB
7
- AB
0
Same as
Microprocessor Mode
Internal
Φ
Port P1
7
- P1
0
I/O Port
Internal
Φ
Port P2
7
- P1
0
I/O Port
Φ
Internal
Port P1
7
- P1
0
Address
Output
AB
15
- AB
8
Same as
Microprocessor Mode
Φ
Internal
Port P3
7
- P3
0
I/O Port
Φ
Internal
Port P2
7
- P2
0
Data
I/O
DB
7
- DB
0
Φ
Internal
Same as
Microprocessor Mode
Same as
Microprocessor Mode
Port 3
4
Port 3
7
Port 3
6
Port 3
5
Port 3
3
RD Output
WR Output
SYNCout
DMAout Output
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