MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 47

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

MC68HC05K0 • MC68HC05K1 — Rev. 2.0
the I bit is cleared during the return from interrupt, the CPU can
recognize the new interrupt request.
The PA3–PA0 pins are positive edge triggered only or positive-edge and
high- level triggered, depending on the mask option selected.
When the positive edge and high level-sensitive trigger mask option is
selected:
Edge- and level-sensitive triggering allows multiple external interrupt
sources to be wire-ORed to any of the PA3–PA0 pins. As long as any
source is holding a PA3–PA0 pin high, an external interrupt request is
latched, and the CPU continues to execute the interrupt service routine.
When the positive edge-sensitive-only trigger mask option is selected:
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A rising edge or a high level on a PA3–PA0 pin latches an external
interrupt request if and only if all other PA3–PA0 pins are low and
the IRQ/V
A falling edge or a low level on the IRQ/V
interrupt request if and only if all of the PA3–PA0 pins are low.
As long as any PA3–PA0 pin is high or the IRQ/V
external interrupt request is present, and the CPU continues to
execute the interrupt service routine.
A rising edge on any one of the PA3–PA0 pins latches an external
interrupt request if all other PA3–PA0 pins are low and the
IRQ/V
A falling edge on the IRQ/V
request if and only if all of the PA3–PA0 pins are low.
A subsequent PA3–PA0 pin interrupt request can be latched only
after the voltage level of the previous PA3–PA0 interrupt signal
returns to a logic 0 and then rises again to a logic 1.
A subsequent IRQ/V
after the voltage level of the previous IRQ/V
returns to a logic 1 and then falls again to a logic 0.
PP
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pin is high.
PP
pin is high.
Interrupts
PP
pin interrupt request can be latched only
PP
pin latches an external interrupt
PP
pin latches an external
PP
interrupt signal
PP
pin is low, an
Interrupt Types
Technical Data
Interrupts