MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 206

• Manufacturer Part Number: MC68HC08AZ60ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

External Interrupt Module (IRQ)
15.5 IRQ Module During Break Interrupts
15.6 IRQ Status and Control Register (ISCR)
Advance Information
206
Address:
The system integration module (SIM) controls whether the IRQ interrupt
latch can be cleared during the break state. The BCFE bit in the SIM
break flag control register (SBFCR) enables software to clear the latches
during the break state. See SIM Break Flag Control Register
(SBFCR).
To allow software to clear the IRQ latch during a break interrupt, write a
logic ’1’ to the BCFE bit. If a latch is cleared during the break state, it
remains cleared when the MCU exits the break state.
To protect the latches during the break state, write a logic ‘0’ to the BCFE
bit. With BCFE at logic ‘0’ (its default state), writing to the ACK bit in the
IRQ status and control register during the break state has no effect on
the IRQ latch.
The IRQ status and control register (ISCR) controls and monitors
operation of the IRQ module. The ISCR performs the following functions:
Reset:
Read:
Write:
•
•
•
•
Indicates the state of the IRQ interrupt flag
Clears the IRQ interrupt latch
Masks IRQ interrupt requests
Controls triggering sensitivity of the IRQ interrupt pin
Figure 15-3. IRQ Status and Control Register (ISCR)
$001A
Bit 7
R
R
0
0
External Interrupt Module (IRQ)
= Reserved
R
6
0
0
R
5
0
0
R
4
0
0
IRQF
R
3
0
MC68HC08AZ60A — Rev 0.0
ACK
2
0
0
IMASK
1
0
MOTOROLA
MODE
Bit 0
0