參數(shù)資料
型號: M37920FGCHP
廠商: Mitsubishi Electric Corporation
英文描述: Single Chip 16 Bits CMOS Microcomputer(16位單片機)
中文描述: 單片微機16位的CMOS(16位單片機)
文件頁數(shù): 42/158頁
文件大小: 1261K
代理商: M37920FGCHP
M37920FCCGP, M37920FCCHP
M37920FGCGP, M37920FGCHP
42
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
As shown in Figure 25, 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 5E
16
) shown in Figure 26. Table 16 shows the relation-
ship between these bits and the number of cycles. After a reset, the
processor mode register 0 is initialized to
00
16.
Therefore, the long-
est time is automatically set, however, the shortest time must be se-
lected by software.
Table 15.
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
7
Not change value of IPL.
Not change value of IPL.
Table 16. Relationship between interrupt priority detection time select
bit and number of cycles
Priority detection time select bit
Bit 5
0
0
1
0
Bit 4
0
1
7 cycles of
φ
4 cycles of
φ
2 cycles of
φ
Number of cycles
(Note)
Fig. 25 Interrupt priority detection time
Operation code fetch cycle
φ
Sampling pulse
Priority detection time
Select one between 0 to
2 with bits 4 and 5 of
processor mode register 0
0
1
2
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