參數(shù)資料
型號: M38B57MC-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP80
封裝: 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 69/70頁
文件大?。?/td> 1041K
代理商: M38B57MC-XXXFP
MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
FUNCTIONAL DESCRIPTION
Central Processing Unit (CPU)
The 38B5 group uses the standard 740 family instruction set. Refer
to the table of 740 family addressing modes and machine instruc-
tions 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 MUL, DIV, WIT and STP instructions can be used.
Fig. 5 Structure of CPU Mode Register
[CPU Mode Register] CPUM
The CPU mode register contains the stack page selection bit and
internal system clock control bits. The CPU mode register is allo-
cated at address 003B16.
CPU mode register
(CPUM (CM) : address 003B16)
b7
b0
Stack page selection bit
0 : 0 page
1 : 1 page
Main clock (XIN-XOUT) stop bit
0 : oscillating
1 : stopped
Main clock division ratio selection bit
0 : f(XIN)
(high-speed mode)
1 : f(XIN)/4 (middle-speed mode)
Internal system clock selection bit
0 : XIN–XOUT selection (middle-/high-speed mode)
1 : XCIN–XCOUT selection (low-speed mode)
Processor mode bits
b1 b0
0
0 : Single-chip mode
0
1
0
Not available
1
Port XC switch bit
0 : I/O port function (stop oscillating)
1 : XCIN-XCOUT oscillating function
XCOUT drivability selection bit
0 : Low drive
1 : High drive
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