參數(shù)資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數(shù): 93/152頁
文件大?。?/td> 897K
代理商: MC68HC05L25PB
External Interrupt (IRQ)
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
45
6.6.3 Interrupt Status Register
IRQF — External Interrupt (IRQ) Flag
A falling edge on the IRQ pin sets the IRQF bit. If the IRQE bit and this bit are set and the interrupt
mask is cleared, an interrupt is generated. This is a read-only bit. Clearing IRQF is accomplished by
writing a one to the RIRQF bit. Reset clears this bit.
Bits 6–5 — Reserved
These bits are not used and always read zero.
KWIF — Key Wakeup Interrupt Flag
When the KWIEx bit in the KWIEN register is set, the falling edge at the KWIx pin sets the KWIF bit. If
the KWIE bit and this bit are set, an interrupt is generated. This bit is a read-only bit and clearing it is
accomplished by writing a one to the RKWIF bit. Reset clears this bit.
RIRQF — Reset IRQ Flag
The RIRQF bit is a write-only bit and always read as zero. Writing a one to this bit clears the IRQF bit
and writing zero to this bit has no effect.
1 = Clear IRQF
0 = No effect
Bits 2–1 — Reserved
These bits are not used and always read zero.
RKWIF — Reset KWI Flag
The RKWIF bit is a write-only bit and always read as zero. Writing a one to this bit clears the KWIF bit,
and writing zero to this bit has no effect.
1 = Clear KWIF
0 = No effect
Address:
$0009
Bit 7
654321
Bit 0
Read:
IRQF
0
KWIF
0000
Write:
RIRQF
RKWIF
Reset:
00000000
= Unimplemented
Figure 6-3. Interrupt Status Register (INSTR)
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