參數資料
型號: MC68HC08KH12A
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數: 148/178頁
文件大?。?/td> 925K
代理商: MC68HC08KH12A
External Interrupt (IRQ)
MC68HC08KH12A Data Sheet, Rev. 1.1
148
Freescale Semiconductor
14.5 IRQ Status and Control Register (ISCR)
The IRQ Status and Control Register (ISCR) controls and monitors operation of the IRQ module. The
ISCR has the following functions:
Shows the state of the IRQ1 flag
Clears the IRQ1 latch
Masks IRQ1 and interrupt request
Controls triggering sensitivity of the IRQ1 interrupt pin
IRQF1 — IRQ1 Flag
This read-only status bit is high when the IRQ1 interrupt is pending.
1 = IRQ1 interrupt pending
0 = IRQ1 interrupt not pending
ACK1 — IRQ1 Interrupt Request Acknowledge Bit
Writing a logic one to this write-only bit clears the IRQ1 latch. ACK1 always reads as logic zero. Reset
clears ACK1.
IMASK1 — IRQ1 Interrupt Mask Bit
Writing a logic one to this read/write bit disables IRQ1 interrupt requests. Reset clears IMASK1.
1 = IRQ1 interrupt requests disabled
0 = IRQ1 interrupt requests enabled
MODE1 — IRQ1 Edge/Level Select Bit
This read/write bit controls the triggering sensitivity of the IRQ1 pin. Reset clears MODE1.
1 = IRQ1 interrupt requests on falling edges and low levels
0 = IRQ1 interrupt requests on falling edges only
Address: $001E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
IRQF1
0
IMASK1
MODE1
Write:
ACK1
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 14-3. IRQ Status and Control Register (ISCR)
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