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參數(shù)資料
| 型號： | M38B79MFH-A154FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 20/109頁 |
| 文件大?。?/td> | 1559K |
| 代理商： | M38B79MFH-A154FP |
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
20
INTERRUPTS
Interrupts occur by twenty two sources: five external, sixteen inter-
nal, and one software.
Interrupt Control
Each interrupt except the BRK instruction interrupt has both an inter-
rupt request bit and an interrupt enable bit, and is controlled by the
interrupt disable flag. An interrupt occurs if the corresponding inter-
rupt request and enable bits are
“
1
”
and the interrupt disable flag is
“
0.
”
Interrupt enable bits can be set or cleared by software. Interrupt
request bits can be cleared by software, but cannot be set by soft-
ware. The BRK instruction interrupt and reset cannot be disabled
with any flag or bit. The I flag disables all interrupts except the BRK
instruction interrupt and reset. If several interrupts requests occur at
the same time, the interrupt with highest priority is accepted first.
Interrupt Operation
Upon acceptance of an interrupt the following operations are auto-
matically performed:
1. The contents of the program counter and processor status
register are automatically pushed onto the stack.
2. The interrupt disable flag is set and the corresponding
interrupt request bit is cleared.
3. The interrupt jump destination address is read from the vector
table into the program counter.
Interrupt Source Selection
Any of the following interrupt sources can be selected by the inter-
rupt source switch register (address 0039
16
).
1. INT
1
or Serial I/O3
2. INT
3
or Serial I/O2 transmit
3. INT
4
or A-D conversion
I
Note
When the active edge of an external interrupt (INT
0
–
INT
4
) is set or
when switching interrupt sources in the same vector address, the
corresponding interrupt request bit may also be set. Therefore, please
take following sequence:
(1) Disable the external interrupt which is selected.
(2) Change the active edge in interrupt edge selection register
(3) Clear the set interrupt request bit to
“
0.
”
(4) Enable the external interrupt which is selected.
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