MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 360

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

18.5 IRQ Module During Break Interrupts
18.6 IRQ Status and Control Register (INTSCR)
MC68HC908LJ12
Freescale Semiconductor
—
Rev. 2.1
The system integration module (SIM) controls whether the IRQ latch can
be cleared during the break state. The BCFE bit in the break flag control
register (BFCR) enables software to clear the latches during the break
state. (See
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 (INTSCR) controls and monitors
operation of the IRQ module. The INTSCR has the following functions:
•
•
•
•
Shows the state of the IRQ flag
Clears the IRQ latch
Masks IRQ and interrupt request
Controls triggering sensitivity of the IRQ interrupt pin
Section 22. Break Module
External Interrupt (IRQ)
(BRK).)
External Interrupt (IRQ)
Technical Data
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