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M38749MAD-XXXFS Datasheet(PDF) 11 Page - Mitsubishi Electric Semiconductor

Part # M38749MAD-XXXFS
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

M38749MAD-XXXFS Datasheet(HTML) 11 Page - Mitsubishi Electric Semiconductor

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11
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
FUNCTIONAL DESCRIPTION
CENTRAL PROCESSING UNIT (CPU)
The 3874 group uses the standard 740 Family instruction set. Re-
fer to the table of 740 Family addressing modes and machine
instructions or the 740 Family Software Manual for details on the
instruction set.
Machine-resident 740 Family instructions are as follows:
The FST and SLW instructions cannot be used.
The STP, WIT, MUL, and DIV instructions can be used.
[CPU Mode Register (CPUM)] 003B16
The CPU mode register contains the stack page selection bit and
the internal system clock selection bit etc.
The CPU mode register is allocated at address 003B16.
Fig. 8 Structure of CPU mode register
CPU mode register
(CPUM : address 003B16)
b7
b0
Stack page selection bit
0 : Page 0
1 : Page 1
XCOUT drivability selection bit
0 : Low drive
1 : High drive
Processor mode bits
b1 b0
0
0 : Single-chip mode
0
1 :
1
0 :
Not available
1
1 :
Port XC switch bit
0 : I/O port function
1 : XCIN–XCOUT oscillating function
Main clock (X IN–XOUT) stop bit
0 : Oscillating
1 : Stopped
Main clock division ratio selection bits
b7 b6
0
0 :
φ = f(XIN)/2 (high-speed mode)
0
1 :
φ = f(XIN)/8 (middle-speed mode)
1
0 :
φ = f(XCIN)/2 (low-speed mode)
1
1 :
φ = f(XIN) (double-speed mode)
Note: When setting b7 to b3, refer to notes of Figure 71.


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