參數(shù)資料
型號： MC68HC08LT8CFGE
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù)： 14/156頁
文件大?。?/td> 1107K
代理商： MC68HC08LT8CFGE
External Interrupt (IRQ)
MC68HC08LT8 Data Sheet, Rev. 1
110
Freescale Semiconductor
10.5 IRQ Status and Control Register (INTSCR)
The IRQ status and control register (INTSCR) controls and monitors operation of the IRQ module. The
INTSCR has the following functions:
Shows the state of the IRQ flag
Clears the IRQ latch
Masks IRQ and interrupt request
Controls triggering sensitivity of the IRQ interrupt pin
IRQF — IRQ Flag Bit
This read-only status bit is high when the IRQ interrupt is pending.
1 = IRQ interrupt pending
0 = IRQ interrupt not pending
ACK — IRQ Interrupt Request Acknowledge Bit
Writing a logic one to this write-only bit clears the IRQ latch. ACK always reads as logic zero. Reset
clears ACK.
IMASK — IRQ Interrupt Mask Bit
Writing a logic one to this read/write bit disables IRQ interrupt requests. Reset clears IMASK.
1 = IRQ interrupt requests disabled
0 = IRQ interrupt requests enabled
MODE — IRQ Edge/Level Select Bit
This read/write bit controls the triggering sensitivity of the IRQ pin. Reset clears MODE.
1 = IRQ interrupt requests on falling edges and low levels
0 = IRQ interrupt requests on falling edges only
Address: $001E
Bit 7
654321
Bit 0
Read:
0000
IRQF
0
IMASK
MODE
Write:
ACK
Reset:
00000000
= Unimplemented
Figure 10-3. IRQ Status and Control Register (INTSCR)
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