參數(shù)資料
型號: M37754M8C-XXXHP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP100
封裝: 0.50 MM PITCH, FINE PITCH, PLASTIC, QFP-100
文件頁數(shù): 28/114頁
文件大?。?/td> 1116K
代理商: M37754M8C-XXXHP
MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
20
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
As shown in Figure 13, 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 14. Table 5 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 4. Value set in processor interrupt level (IPL) during an interrupt
Interrupt types
Reset
____
DBC
Watchdog timer
Zero divide
BRK instruction
Setting value
0
7
Not change value of IPL.
Table 5. 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
φBIU
4 cycles of
φBIU
2 cycles of
φBIU
Number of cycles
Fig. 13 Interrupt priority detection time
Operation code fetch cycle
φBIU
Sampling pulse
Priority detection time
Select one from 0 to 2 with
bits 4 and 5 of processor
mode register 0
0
1
2
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