參數(shù)資料
型號： MC68HC805K3DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 59/119頁
文件大小： 2870K
代理商： MC68HC805K3DW
General Release Specication
Hardware Interrupts
MC68HC805K3 — Rev. 1.0
44
Interrupts
If the mask option for edge-sensitive only IRQ is used, only the IRQ
latch output can activate an IRQF flag which creates a request to the
CPU to generate the IRQ interrupt sequence. This makes the IRQ
interrupt sensitive to these cases:
If the port A interrupts are disabled by a mask option register bit,
only a falling edge on the IRQ pin initiates an IRQ interrupt.
If the port A interrupts are enabled by a mask option register bit,
these conditions initiate an IRQ interrupt:
–
A falling edge on the IRQ pin with all the PA0 through PA3 pins
at a low level
–
A rising edge on one PA0 through PA3 pin with all other PA0
through PA3 pins at a low level and the IRQ pin at a high level
If the mask option register bit for edge- and level-sensitive IRQ is used,
the active high state of the IRQ latch input also can activate an IRQF
flag, which creates a request to the CPU to generate the IRQ interrupt
sequence. This makes the IRQ interrupt sensitive to these cases:
If the port A Interrupts are disabled by a mask option register bit,
only these conditions initiate an IRQ interrupt:
–
A low level on the IRQ pin
–
Falling edge on the IRQ pin
If the port A interrupts are enabled by a mask option register bit,
these conditions initiate an IRQ interrupt:
–
A low level on the IRQ pin with all the PA0 through PA3 pins at
a low level.
–
Falling edge on the IRQ pin with all the PA0 through PA3 pins
at a low level.
–
High level on any one of the PA0 through PA3 pins with the
IRQ pin at a high level.
–
Rising edge on any PA0 through PA3 pin with all other PA0
through PA3 pins at a low level and the IRQ pin at a high level.
The IRQE enable bit controls whether an active IRQF flag can generate
an IRQ interrupt sequence. This interrupt is serviced by the interrupt
service routine located at the address specified by the contents of $03FA
and $03FB.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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