M37640E8 查看數據表（PDF） - MITSUBISHI ELECTRIC
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M37640E8 Datasheet PDF : 172 Pages
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7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
2.5.2 Memory Expansion
In this mode, Ports 0 and 1 output the address bus (AB0-AB15), port 2 acts as the data bus input and
output, and port 3 bits 7 to 3 output RD, WR, SYNCout, Φout, 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.
CPMA1
CPMA0
Port Mode
Port P0
0
0
Single Chip Mode
Internal
Φ
Port P07 - P00
I/O Port
Port P1
Internal
Φ
Port P17 - P10
I/O Port
Port P2
Internal
Φ
Port P27 - P10
I/O Port
Port P3
Internal
Φ
Port P37 - P30
I/O Port
1
0
Microprocessor Mode
Internal
Φ
Port P07 - P00
Address
Output
AB7 - AB0
Internal
Φ
Port P17 - P10
Address
Output
AB15 - AB8
Internal
Φ
Port P27 - P20
Data
I/O
DB7 - DB0
Internal
Φ
Port 34
Port 37
Port 36
RD Output
WR Output
Port 35
SYNCout
DMAout Output
Port 33
0
1
Memory Expansion Mode
Same as
Microprocessor Mode
Same as
Microprocessor Mode
Same as
Microprocessor Mode
Same as
Microprocessor Mode
Figure 2-16. Function of Ports P0-P3 in each Processor Mode
2-18
7/9/98
Processor Modes
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