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M37640E8FS Datasheet(PDF) 9 Page - Mitsubishi Electric Semiconductor

Part # M37640E8FS
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M37640E8FS Datasheet(HTML) 9 Page - Mitsubishi Electric Semiconductor

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Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
9
1.12 PROCESSOR MODES
The operation modes are described below. The memory
maps for the first three modes are shown in Figure 1.8.
Single chip mode is normally entered after reset. How-
ever, if the MCU has a CNVss pin, holding this pin high
will cause microprocessor mode to be entered after re-
set. After the reset sequence has completed, the mode
can be changed with software by modifying the value of
bits 0 and 1 of CPMA. However, while CNVss is high,
bit 1 of CPMA is “1” and cannot be changed.
Single Chip
Mode
Memory
Expansion Mode
Microprocessor
Mode
CPMA, CPMB and
Int Registers
P0 - P3
Internal RAM
(Zero Page)
Internal RAM
Inaccessible Area
Reserved Area
ROM
Interrupt Vectors
Reserved Area
0000
0007
0008
000F
0010
006F
0070
00FF
0100
046F
0470
7FFF
8000
807F
8080
FFC9
FFCA
FFFB
FFFC
FFFF
CPMA, CPMB and
Int Registers
External Memory
Internal RAM
(Zero Page)
Internal RAM
External Memory
Reserved Area
ROM
Interrupt Vectors
Reserved Area
0000
0007
0008
000F
0010
006F
0070
00FF
0100
046F
0470
7FFF
8000
807F
8080
FFC9
FFCA
FFFB
FFFC
FFFF
CPMA, CPMB and
Int Registers
External Memory
Internal RAM
(Zero Page)
Internal RAM
External Memory
0000
0007
0008
000F
0010
006F
0070
00FF
0100
046F
0470
FFFF
SFR
SFR
SFR
Fig. 1.8. Operation Modes Memory Maps


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