MC68HC908LJ12 Datasheet, PDF (361/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

External Interrupt (IRQ)
Address:
Read:
Write:
Reset:
$001E
Bit 7
0
0
6
5
0
0
0
0
= Unimplemented
4
3
2
1
Bit 0
0
IRQF
0
IMASK MODE
ACK
0
0
0
0
0
Figure 18-2. IRQ Status and Control Register (INTSCR)
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 1 to this write-only bit clears the IRQ latch. ACK always
reads as logic 0. Reset clears ACK.
IMASK — IRQ Interrupt Mask Bit
Writing a logic 1 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
Technical Data
362
External Interrupt (IRQ)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor