MC68HC708MP16 Datasheet, PDF (344/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

External Interrupt (IRQ)
17.6 IRQ Module During Break Mode
The system integration module (SIM) controls whether the IRQ1
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 7.7.4 SIM Break Flag Control
Register.)
To allow software to clear the IRQ1 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 ACK1 bit in the
IRQ status and control register during the break state has no effect on
the IRQ latches. (See 17.7 IRQ Status and Control Register.)
Technical Data
344
External Interrupt (IRQ)
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor