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| 型号： | MC68HC05V7FN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 114/170页 |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7FN |
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MOTOROLA
SECTION 5: INTERRUPTS
Page 34
MC68HC05V7 Specification Rev. 1.0
IRQ latch output can activate an IRQF ag which creates an interrupt request to the CPU
to generate the external interrupt sequence.
When edge sensitivity is selected for the IRQ interrupt, it is sensitive to the following cases:
Falling edge on the IRQ pin.
Falling edge on any Port A or Port C pin with IRQ enabled.
If the LEVEL option selected, the active low state of the IRQ pin can also activate an IRQF
flag, which creates an IRQ request to the CPU to generate the IRQ interrupt sequence.
When edge and level sensitivity is selected for the IRQ interrupt, it is sensitive to the
following cases:
Low level on the IRQ pin.
Falling edge on the IRQ pin.
Falling edge on any Port A or Port C pin with IRQ enabled.
The IRQE enable bit controls whether an active IRQF flag (IRQ pin interrupt) can generate
an IRQ interrupt sequence. The IRQPAE enable bit controls whether an active IRQPAF flag
(Port A interrupt) can generate an IRQ interrupt sequence. The IRQPCE enable bit controls
whether an active IRQPCF flag (Port C interrupt) can generate an IRQ interrupt sequence.
The IRQ interrupt is serviced by the interrupt service routine located at the address
specified by the contents of $3FFA and $3FFB.
The IRQF latch is automatically cleared by entering the interrupt service routine to maintain
compatibility with existing M6805 interrupt servicing protocol. To allow the user to identify
the source of the interrupt, the port interrupt flags (IRQPAF and IRQPCF) are not cleared
automatically. These flags must be cleared within the interrupt handler prior to exit in order
to prevent repeated re-entry. This is achieved by writing a logic one to the IRQA (IRQ
acknowledge) bit, which will clear all pending IRQ interrupts (including a pending IRQ pin
interrupt).
The interrupt request flags (IRQPAF and IRQPCF) are read only and cannot be cleared by
writing to them. The acknowledge flag always reads as a logic 0. Together, these features
permit the safe use of read-modify-write instructions (for example, BSET, BCLR) on the
ICSR.
NOTE:
Although read modify write instruction use is allowable on the ICSR, shift
operations should be avoided due to the possibility of inadvertently setting
the IRQA.
5.5.1
IRQ CONTROL/STATUS REGISTER (ICSR) $1F
The IRQ interrupt function is controlled by the ICSR located at $001F. All unused bits in the
ICSR will read as logic zeros. The IRQF bit is cleared and IRQE bit is set by reset.
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