参数资料
型号: M37902FCCHP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 26 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 88/143页
文件大小: 1148K
代理商: M37902FCCHP
49
M37902FCCHP, M37902FGCHP, M37902FJCHP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
As shown in Figure 38, 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 24. Table 11 shows the relation-
ship between these bits and the number of cycles. After a reset, the
processor mode register 0 is initialized to “0016.” Therefore, the long-
est time is automatically set, however, the shortest time must be se-
lected by software.
Table 10. Value loaded in processor interrupt level (IPL) during an interrupt
Interrupt types
Reset
Watchdog timer
NMI
Zero divide
Address matching detection
Setting value
0
7
Not change value of IPL.
Table 11. 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. 38 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
b5b4
(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.
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