mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 345

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

17.7 IRQ Status and Control Register
MC68HC708MP16
Freescale Semiconductor
—
Rev. 3.1
Address:
Reset:
The IRQ status and control register (ISCR) has these functions:
Read:
Write:
ACK1 — IRQ1 Interrupt Request Acknowledge Bit
IMASK1 — IRQ1 Interrupt Mask Bit
MODE1 — IRQ1 Edge/Level Select Bit
IRQ1F — IRQ1 Flag
•
•
•
Writing a logic 1 to this write-only bit clears the IRQ1 latch. ACK1
always reads as logic 0. Reset clears ACK1.
Writing a logic 1 to this read/write bit disables IRQ1 interrupt requests.
Reset clears IMASK1.
This read/write bit controls the triggering sensitivity of the IRQ1/V
pin. Reset clears MODE1.
This read-only bit acts as a status flag, indicating an IRQ1 event
occurred.
1 = IRQ1 interrupt requests disabled
0 = IRQ1 interrupt requests enabled
1 = IRQ1/V
0 = IRQ1/V
1 = External IRQ1 event occurred
0 = External IRQ1 event did not occur
Clears the IRQ1 interrupt latch
Masks IRQ1 interrupt requests
Controls triggering sensitivity of the IRQ1/V
Figure 17-4. IRQ Status and Control Register (ISCR)
$001E
0
0
External Interrupt (IRQ)
= Unimplemented
PP
PP
0
0
interrupt requests on falling edges and low levels
interrupt requests on falling edges only
0
0
0
0
IRQ1F
0
ACK1
PP
0
0
External Interrupt (IRQ)
interrupt pin
IMASK1
0
Technical Data
MODE1
0
PP
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