mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 220

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

External Interrupt Module (IRQ)
16.6 IRQ Module During Break Interrupts
16.7 IRQ Status and Control Register
Technical Data
Address:
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
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 latch 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 latch.
The IRQ status and control register (ISCR) controls and monitors
operation of the IRQ module. The ISCR has these functions:
Reset:
Read:
Write:
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Freescale Semiconductor, Inc.
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Shows the state of the IRQ1 interrupt flag
Clears the IRQ1 interrupt latch
Masks IRQ1 interrupt request
Controls triggering sensitivity of the IRQ interrupt pin
Figure 16-4. IRQ Status and Control Register (ISCR)
$001A
Bit 7
R
R
0
0
External Interrupt Module (IRQ)
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= Reserved
R
6
0
0
R
5
0
0
R
4
0
0
9.8.3 SIM Break Flag Control
IRQF1
R
3
0
MC68HC908AS60 — Rev. 1.0
ACK1
2
0
0
IMASK1
1
0
MODE1
Bit 0
0