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參數(shù)資料
| 型號： | M37532M4 |
| 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 |
| 文件頁數(shù)： | 15/50頁 |
| 文件大?。?/td> | 524K |
| 代理商： | M37532M4 |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7532 Group
MITSUBISHI MICROCOMPUTERS
15
Interrupts
Interrupts occur by 13 different sources : 3 external sources, 9 inter-
nal sources and 1 software source.
Interrupt control
All interrupts except the BRK instruction interrupt have an interrupt
request bit and an interrupt enable bit, and they are controlled by the
interrupt disable flag. When the interrupt enable bit and the interrupt
request bit are set to “1” and the interrupt disable flag is set to “0”, an
interrupt is accepted.
The interrupt request bit can be cleared by program but not be set.
The interrupt enable bit can be set and cleared by program.
It becomes usable by switching CNTR
0
and AD interrupt sources
with bit 7 of the interrupt edge selection register, timer 2 and serial I/
O2 interrupt sources with bit 6, and timer X and key-on wake-up in-
terrupt sources with bit 5.
The reset and BRK instruction interrupt can never be disabled with
any flag or bit. All interrupts except these are disabled when the in-
terrupt disable flag is set.
When several interrupts occur at the same time, the interrupts are
received according to priority.
Interrupt operation
Upon acceptance of an interrupt the following operations are auto-
matically performed:
1. The processing being executed is stopped.
2. The contents of the program counter and processor status regis-
ter are automatically pushed onto the stack.
3. The interrupt disable flag is set and the corresponding interrupt
request bit is cleared.
4. Concurrently with the push operation, the interrupt destination
address is read from the vector table into the program counter.
Notes on use
When the active edge of an external interrupt (INT
0
, CNTR
0
) is set,
the interrupt request bit may 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. (in
case of CNTR
0
: Timer X mode register)
3. Clear the set interrupt request bit to “0”.
4. Enable the external interrupt which is selected.
Table 4 Interrupt vector address and priority
Vector addresses (Note 1)
High-order
FFFD
16
FFFB
16
FFF9
16
FFF7
16
FFF5
16
FFF3
16
FFF1
16
FFEF
16
FFED
16
Priority
1
2
3
4
5
6
7
8
9
Low-order
FFFC
16
FFFA
16
FFF8
16
FFF6
16
FFF4
16
FFF2
16
FFF0
16
FFEE
16
FFEC
16
Interrupt request generating conditions
At reset input
At completion of UART data receive
At detection of IN token
At completion of UART transmit shift or
when transmit buffer is empty
At detection of SETUP/OUT token or
At detection of Reset/ Suspend/ Resume
At detection of either rising or falling edge
of INT
0
input
At timer X underflow
At falling of conjunction of input logical
level for port P0 (at input)
At timer 1 underflow
At timer 2 underflow
At completion of transmit/receive shift
At detection of either rising or falling edge
of CNTR
0
input
At completion of A-D conversion
At BRK instruction execution
Remarks
Non-maskable
Valid in UART mode
Valid in USB mode
Valid in UART mode
Valid in USB mode
External interrupt
(active edge selectable)
External interrupt (valid at falling)
STP release timer underflow
External interrupt (active edge
selectable)
Non-maskable software interrupt
Interrupt source
Reset (Note 2)
UART receive
USB IN token
UART transmit
USB SETUP/OUT token
Reset/Suspend/Resume
INT
0
Timer X
Key-on wake-up
Timer 1
Timer 2
Serial I/O2
CNTR
0
A-D conversion
BRK instruction
Note 1:
Vector addressed contain internal jump destination addresses.
2:
Reset function in the same way as an interrupt with the highest priority.
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