S9S08AW16A FREESCALE [Freescale Semiconductor, Inc], S9S08AW16A Datasheet - Page 71

• Manufacturer Part Number: S9S08AW16A
• Description: HCS08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

5.9.1
This direct page register includes status and control bits which are used to configure the IRQ function,
report status, and acknowledge IRQ events.
Freescale Semiconductor
IRQMOD
IRQEDG
IRQPDD
IRQACK
Reset
IRQPE
IRQIE
Field
IRQF
6
5
4
3
2
1
0
W
R
Interrupt Pin Request Status and Control Register (IRQSC)
Interrupt Request (IRQ) Pull Device Disable— This read/write control bit is used to disable the internal
pull-up/pull-down device when the IRQ pin is enabled (IRQPE = 1) allowing for an external device to be used.
0 IRQ pull device enabled if IRQPE = 1.
1 IRQ pull device disabled if IRQPE = 1.
Interrupt Request (IRQ) Edge Select — This read/write control bit is used to select the polarity of edges or
levels on the IRQ pin that cause IRQF to be set. The IRQMOD control bit determines whether the IRQ pin is
sensitive to both edges and levels or only edges. When the IRQ pin is enabled as the IRQ input and is configured
to detect rising edges, it has a pull-down. When the IRQ pin is enabled as the IRQ input and is configured to
detect falling edges, it has a pull-up.
0 IRQ is falling edge or falling edge/low-level sensitive.
1 IRQ is rising edge or rising edge/high-level sensitive.
IRQ Pin Enable — This read/write control bit enables the IRQ pin function. When this bit is set the IRQ pin can
be used as an interrupt request.
0 IRQ pin function is disabled.
1 IRQ pin function is enabled.
IRQ Flag — This read-only status bit indicates when an interrupt request event has occurred.
0 No IRQ request.
1 IRQ event detected.
IRQ Acknowledge — This write-only bit is used to acknowledge interrupt request events (write 1 to clear IRQF).
Writing 0 has no meaning or effect. Reads always return 0. If edge-and-level detection is selected (IRQMOD = 1),
IRQF cannot be cleared while the IRQ pin remains at its asserted level.
IRQ Interrupt Enable — This read/write control bit determines whether IRQ events generate an interrupt
request.
0 Interrupt request when IRQF set is disabled (use polling).
1 Interrupt requested whenever IRQF = 1.
IRQ Detection Mode — This read/write control bit selects either edge-only detection or edge-and-level
detection. The IRQEDG control bit determines the polarity of edges and levels that are detected as interrupt
request events. See
0 IRQ event on falling edges or rising edges only.
1 IRQ event on falling edges and low levels or on rising edges and high levels.
0
0
7
Figure 5-2. Interrupt Request Status and Control Register (IRQSC)
= Unimplemented or Reserved
IRQPDD
0
6
Section 5.5.2.2, “Edge and Level
Table 5-3. IRQSC Register Field Descriptions
IRQEDG
MC9S08AC16 Series Data Sheet, Rev. 8
0
5
IRQPE
0
4
Description
Sensitivity” for more details.
IRQF
Chapter 5 Resets, Interrupts, and System Configuration
3
0
IRQACK
0
0
2
IRQIE
0
1
IRQMOD
0
0
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