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MC9S08QG8 Datasheet, PDF (61/300 Pages) Freescale Semiconductor, Inc – 8-BIT HCS08 Central Processor Unit | |||
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Chapter 5 Resets, Interrupts, and General System Control
The IRQ pin, when enabled, defaults to use an internal pullup device (IRQPDD = 0). If the user desires to
use an external pullup, the IRQPDD can be written to a 1 to turn off the internal device.
BIH and BIL instructions may be used to detect the level on the IRQ pin when the pin is conï¬gured to act
as the IRQ input.
NOTE
This pin does not contain a clamp diode to VDD and should not be driven
above VDD.
The voltage measured on the internally pulled up IRQ pin will not be pulled
to VDD. The internal gates connected to this pin are pulled to VDD. The IRQ
pullup should not be used to pull up components external to the MCU. The
internal gates connected to this pin are pulled all the way to VDD.
5.5.2.2 Edge and Level Sensitivity
The IRQMOD control bit reconï¬gures the detection logic so it detects edge events and pin levels. In this
edge detection mode, the IRQF status ï¬ag becomes set when an edge is detected (when the IRQ pin
changes from the deasserted to the asserted level), but the ï¬ag is continuously set (and cannot be cleared)
as long as the IRQ pin remains at the asserted level.
5.5.3 Interrupt Vectors, Sources, and Local Masks
Table 5-2 provides a summary of all interrupt sources. Higher-priority sources are located toward the
bottom of the table. The high-order byte of the address for the interrupt service routine is located at the
ï¬rst address in the vector address column, and the low-order byte of the address for the interrupt service
routine is located at the next higher address.
When an interrupt condition occurs, an associated ï¬ag bit becomes set. If the associated local interrupt
enable is 1, an interrupt request is sent to the CPU. Within the CPU, if the global interrupt mask (I bit in
the CCR) is 0, the CPU will ï¬nish the current instruction; stack the PCL, PCH, X, A, and CCR CPU
registers; set the I bit; and then fetch the interrupt vector for the highest priority pending interrupt.
Processing then continues in the interrupt service routine.
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01
Freescale Semiconductor
61
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