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3.5
Interrupt
2
The F
MC-16LX family has four interrupt functions for suspending the current
processing to pass control to a separately defined program when a specific event
occurs.
• Hardware Interrupt
• Software interrupt
• Interrupts by extended intelligent I/O service (EI
• Exception processing
I Type and Function of Interrupt
G
Hardware Interrupt
This transits control to the interrupt processing program defined by the user in response to the interrupt
request from resources.
G
Software interrupt
This transfers control to the interrupt processing program defined by user by executing an instruction (such
as INT instruction) dedicated to the software interrupt.
G
Interrupts by extended intelligent I/O service (EI
The extended intelligent I/O service (EI
memory. Data can be transferred just by creating the startup-setting program and end program of the
2
EI
OS. At completion of data transfer, the interrupt processing program is executed automatically.
An interrupt generated by the EI
G
Exception processing
If an exception (execution of an undefined instruction) is detected among instructions, ordinary processing
is suspended to perform exception processing. This is equivalent to the above software interrupt instruction
"INT10".
2
OS)
2
OS)
2
OS) provides automatic data transfer between resources and
2
OS is a type of the above hardware interrupt.
CHAPTER 3 CPU
57
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