參數(shù)資料
型號(hào)： M37905M4C-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù)： 20/102頁
文件大小： 881K
代理商： M37905M4C-XXXFP
24
M37905M4C-XXXFP, M37905M4C-XXXSP
M37905M6C-XXXFP, M37905M6C-XXXSP
M37905M8C-XXXFP, M37905M8C-XXXSP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
processor status register (PS) is replaced by the priority level of the
accepted interrupt.
Therefore, multi-level priority interrupts are possible by resetting the
interrupt disable flag I to “0” and enable further interrupts.
For reset, watchdog timer, zero divide, and address match detection
interrupts, which do not have an interrupt control register, the proces-
sor interrupt level (IPL) is set as shown in Table 5.
The interrupt request bit and the interrupt priority level of each inter-
rupt source are sampled and latched at each operation code fetch
cycle while fsys is “H”. However, no sampling pulse is generated until
the cycles whose number is selected by software has passed, even
if the next operation code fetch cycle is generated. The detection of
an interrupt which has the highest priority is performed during that
time.
As shown in Figure 16, there are three different interrupt priority de-
tection time from which one is selected by software. After the se-
lected time has elapsed, the highest priority is determined and is
processed after the currently executing instruction has been com-
pleted.
The time is selected with bits 4 and 5 of the processor mode register
0 (address 5E16) shown in Figure 11. Table 6 shows the relationship
between these bits and the number of cycles. After a reset, the pro-
cessor mode register 0 is initialized to “0016.” Therefore, the longest
time is automatically set, however, the shortest time must be se-
lected by software.
Table 5. Value loaded in processor interrupt level (IPL) during an interrupt
Interrupt types
Reset
Watchdog timer
Zero divide
Address matching detection
Setting value
0
7
Not change value of IPL.
Table 6. Relationship between interrupt priority detection time select
bit and number of cycles
Priority detection time select bit
Bit 5
0
1
Bit 4
0
1
0
7 cycles of fsys
4 cycles of fsys
2 cycles of fsys
Number of cycles (Note)
Fig. 16 Interrupt priority detection time
Operation code fetch cycle
fsys
Sampling pulse
Priority detection time
Select one between 00 to
10 with bits 4 and 5 of
processor mode register 0
0 0
0 1
1 0
b5 b4
(Note)
Note: This pulse resides when 2 cycles of fsys is selected.
Note: For system clock fsys, refer to the section on the clock gener-
ating circuit.
相關(guān)PDF資料
PDF描述
M37905M8C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP64
M37905M8C-XXXSP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP64
M37905M4C-XXXSP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP64
M37905M4C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP64
M37905M8C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP64
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37905M4C-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
M37905M6C-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
M37905M6C-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
M37905M8C-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
M37905M8C-XXXSP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER
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