MC68HC08AZ60 Datasheet, PDF (171/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
External Interrupt Module (IRQ)
IRQ Status and Control Register
IRQ Status and Control Register
The IRQ status and control register (ISCR) controls and monitors
operation of the IRQ module. The ISCR has these functions:
• Shows the state of the IRQ interrupt flag
• Clears the IRQ interrupt latch
• Masks IRQ interrupt request
• Controls triggering sensitivity of the IRQ interrupt pin
Address: $001A
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
IRQF
0
IMASK1 MODE1
Write: R
R
R
R
R
ACK1
Reset: 0
0
0
0
0
0
0
0
R = Reserved
Figure 3. IRQ Status and Control Register (ISCR)
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
ACK1 — IRQ Interrupt Request Acknowledge Bit
Writing a logic 1 to this write-only bit clears the IRQ latch. ACK1
always reads as logic 0. Reset clears ACK1.
IMASK1 — IRQ Interrupt Mask Bit
Writing a logic 1 to this read/write bit disables IRQ interrupt requests.
Reset clears IMASK1.
1 = IRQ interrupt requests disabled
0 = IRQ interrupt requests enabled
7-irq
MOTOROLA
MC68HC08AZ60 — Rev 1.0
External Interrupt Module (IRQ)
171
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