MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 183

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MC68HC708AS48

Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
Address:
Read:
Write:
Reset:
IRQF — IRQ/V
This read-only status bit is high when the IRQ interrupt is 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/V
Writing a logic 1 to this read/write bit disables IRQ/V
requests. Reset clears IMASK.
MODE — IRQ/V
This read/write bit controls the triggering sensitivity of the IRQ/V
pin. Reset clears MODE.
MC68HC708AS48
Rev. 4.0
MOTOROLA
$001A
Bit 7
6
5
0
0
0
R
R
R
0
0
0
R
= Reserved
Figure 14-4. IRQ Status and Control Register (ISCR)
Flag Bit
PP
1 = IRQ/V
interrupt pending
PP
0 = IRQ/V
interrupt not pending
PP
Interrupt Mask Bit
PP
1 = IRQ/V
interrupt requests disabled
PP
0 = IRQ/V
interrupt requests enabled
PP
Edge/Level Select Bit
PP
1 = IRQ/V
interrupt requests on falling edges and low levels
PP
0 = IRQ/V
interrupt requests on falling edges only
PP
External Interrupt
External Interrupt
IRQ Status and Control Register
4
3
2
1
0
IRQF
0
IMASK
R
R
ACK
0
0
0
0
interrupt
PP
Advance Information
Bit 0
MODE
0
PP
183

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