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M68HC08 Datasheet(PDF) 97 Page - Freescale Semiconductor, Inc

Part # M68HC08
Description  Microcontrollers
PDF  188 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 97 Page - Freescale Semiconductor, Inc

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Keyboard/External Interrupt Module (KBI)
Functional Description
MC68HC908RF2 — Rev. 4.0
Data Sheet
MOTOROLA
Keyboard/External Interrupt Module (KBI)
97
Figure 7-4. IRQ Interrupt Flowchart
If the MODEI bit is clear, the IRQ pin is falling-edge sensitive only. With MODEI
clear, a vector fetch or software clear immediately clears the IRQ1 latch.The IRQ1F
bit in the INTKBSCR register can be used to check for pending interrupts. The
IRQ1F bit is not affected by the IMASKI bit, which makes it useful in applications
where polling is preferred.
Use the BIH or BIL instruction to read the logic level on the IRQ pin.
NOTE:
When using the level-sensitive interrupt trigger, avoid false interrupts by masking
interrupt requests in the interrupt routine.
FROM RESET
I BIT SET?
FETCH NEXT
YES
NO
INTERRUPT?
INSTRUCTION
SWI
INSTRUCTION?
RTI
INSTRUCTION?
NO
STACK CPU REGISTERS
NO
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
NO
YES
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
YES
YES
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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