參數(shù)資料
型號(hào): M3851
廠商: Mitsubishi Electric Corporation
英文描述: Single Chip 8 Bits Microcomputer(8位單片機(jī))
中文描述: 單芯片8位單片機(jī)(8位單片機(jī))
文件頁數(shù): 5/61頁
文件大?。?/td> 904K
代理商: M3851
5
3851 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
FUNCTIONAL DESCRIPTION
CENTRAL PROCESSING UNIT (CPU)
The 3851 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)] 003B
16
The CPU mode register contains the stack page selection bit, etc.
The CPU mode register is allocated at address 003B
16
.
Fig. 4 Structure of CPU mode register
CPU mode register
(
CPUM : address
003B
16
)
b7
b0
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (return “1” when read)
(Do not write “0” to this bit.)
Processor mode bits
b1 b0
0 0 : Single-chip mode
0 1 :
1 0 :
Not available
1 1 :
Port X
C
switch bit
0 : I/O port function (stop oscillating)
1 : X
CIN
–X
COUT
oscillating function
Main clock (X
IN
–X
OUT
) stop bit
0 : Oscillating
1 : Stopped
Main clock division ratio selection bits
b7 b6
0 0 :
φ
= f(X
IN
)/2 (high-speed mode)
0 1 :
φ
= f(X
IN
)/8 (middle-speed mode)
1 0 :
φ
= f(X
CIN
)/2 (low-speed mode)
1 1 : Not available
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