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參數(shù)資料
| 型號(hào)： | M30612M4A-417GP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 57/197頁(yè) |
| 文件大?。?/td> | 2673K |
| 代理商： | M30612M4A-417GP |
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Precautions for Interrupts
Mitsubishi microcomputers
M16C / 61 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
57
Precautions for Interrupts
(1) Reading address 00000
16
When maskable interrupt is occurred, CPU read the interrupt information (the interrupt number and
interrupt request level) in the interrupt sequence.
The interrupt request bit of the certain interrupt written in address 00000
16
will then be set to “0”.
Reading address 00000
16
by software sets enabled highest priority interrupt source request bit to “0”.
Though the interrupt is generated, the interrupt routine may not be executed.
Do not read address 00000
16
by software.
(2) Setting the stack pointer
The value of the stack pointer immediately after reset is initialized to 0000
16
. Accepting an interrupt
before setting a value in the stack pointer may become a factor of runaway. Be sure to set a value in
the stack pointer before accepting an interrupt. When using the NMI interrupt, initialize the stack point
at the beginning of a program. Concerning the first instruction immediately after reset, generating any
interrupts including the NMI interrupt is prohibited.
(3) The NMI interrupt
As for the NMI interrupt pin, an interrupt cannot be disabled. Connect it to the V
CC
pin via a resistor
(pull-up) if unused. Be sure to work on it.
The NMI pin also serves as P8
5
, which is exclusively input. Reading the contents of the P8 register
allows reading the pin value. Use the reading of this pin only for establishing the pin level at the time
when the NMI interrupt is input.
Do not reset the CPU with the input to the NMI pin being in the “L” state.
Do not attempt to go into stop mode with the input to the NMI pin being in the “L” state. With the input to
the NMI being in the “L” state, the CM10 is fixed to “0”, so attempting to go into stop mode is turned
down.
Do not attempt to go into wait mode with the input to the NMI pin being in the “L” state. With the input to
the NMI pin being in the “L” state, the CPU stops but the oscillation does not stop, so no power is saved.
In this instance, the CPU is returned to the normal state by a later interrupt.
Signals input to the NMI pin require an "L" level of 1 clock or more, from the operation clock of the CPU.
(4) External interrupt
Either an “L” level or an “H” level of at least 250 ns width is necessary for the signal input to pins INT
0
through INT
2
regardless of the CPU operation clock.
When the polarity of the INT
0
to INT
2
pins is changed, the interrupt request bit is sometimes set to "1".
After changing the polarity, set the interrupt request bit to "0". Figure 1.13.12 shows the procedure for
changing the INT interrupt generate factor.
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PDF描述 |
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| M30612M4A-422GP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M8A | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612MAA | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M8-121FP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612MA-310FP | MICA RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M30612M4A-422GP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M4A-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M4A-XXXGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M8-121FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30612M8A | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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