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參數(shù)資料
| 型號： | MC68HC705V8CFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 121/172頁 |
| 文件大?。?/td> | 890K |
| 代理商： | MC68HC705V8CFN |
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SECTION 5: INTERRUPTS
MOTOROLA
Page 41
MC68HC705V8 Specification Rev. 2.1
.
Figure 5-3:
IRQ Status & Control Register
5.5.1.1
IRQA - IRQ Interrupt Acknowledge
The IRQA acknowledge bit clears an IRQ interrupt by clearing the IRQ, IRQPA and IRQPC
latches. This is achieved by writing a logic one to the IRQA acknowledge bit. Writing a logic
zero to the IRQA acknowledge bit will have no effect on the any of the IRQ latches. If either
the IRQ, IRQPA or IRQPC latch is not cleared within the IRQ service routine the CPU will
re-enter the IRQ interrupt sequence continuously until the IRQ latches are all cleared. The
IRQA is useful for cancelling unwanted or spurious interrupts which may have occurred
while servicing the initial IRQ interrupt. The IRQA acknowledge bit will always read as a
logic zero. The IRQA function is activated by reset.
NOTE:
The IRQ latch is cleared automatically during the IRQ vector fetch. The
IRQPA and IRQPC latches are not cleared automatically (to permit
interrupt source differentiation) and must be cleared from within the IRQ
service routine.
5.5.1.2
IRQPCF - Port C IRQ Interrupt Request
The IRQPCF flag bit indicates that a Port C IRQ request is pending. Writing to the IRQPCF
flag bit will have no effect on it. The IRQPCF flag bit must be cleared by writing a logic one
to the IRQA acknowledge bit. In this way an additional IRQPCF ag bit that is set while in
the service routine can be ignored by clearing the IRQPCF ag bit before exiting the service
routine. If the additional IRQPCF ag bit is not cleared in the IRQ service routine and the
IRQPCE enable bit remains set, the CPU will re-enter the IRQ interrupt sequence
continuously until either the IRQPCF flag bit or the IRQPCE enable bit is clear. This bit is
operational regardless of the state of the IRQPCE bit. The IRQPCF bit is cleared by reset.
5.5.1.3
IRQPAF - Port A IRQ Interrupt Request
The IRQPAF flag bit indicates that a Port A IRQ request is pending. Writing to the IRQPAF
flag bit will have no effect on it. The IRQPAF flag bit must be cleared by writing a logic one
to the IRQA acknowledge bit. In this way an additional IRQPAF ag bit that is set while in
the service routine can be ignored by clearing the IRQPAF ag bit before exiting the service
routine. If the additional IRQPAF ag bit is not cleared in the IRQ service routine and the
IRQPAE enable bit remains set, the CPU will re-enter the IRQ interrupt sequence
continuously until either the IRQPAF flag bit or the IRQPAE enable bit is clear. This bit is
operational regardless of the state of the IRQPAE bit. The IRQPAF bit is cleared by reset.
ICSR
$001F
1
7
W
R
0000000
reset
6543210
IRQE
IRQF
0
IRQA
0
IRQPAF
IRQPAE
IRQPCE
IRQPCF
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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