Overview - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 3 INTERRUPT
3.1

Overview

This chapter explains interrupts and direct access (DMA).
• Hardware interrupt
• Software interrupt
Interrupt by µ µ µ µ DMA/Extended intelligent I/O service (EI
•
• Exception processing
I Types and functions of interrupts
❍ Hardware interrupt
Control is moved to the user-defined interrupt processing program in response to an interrupt
request from a peripheral function.
❍ Software interrupt
Control is moved to the user-defined interrupt processing program by execution of a dedicated
instruction for software interrupts (e.g., INT instruction).
❍ Interrupt by µ µ µ µ DMA/Extended intelligent I/O service (EI
µDMA/Extended intelligent I/O service (EI
between peripheral functions and memory. Previous data transfers by an interrupt processing
program is provided in the same way as the direct memory access (DMA). When a transfer of
data of a specified count is completed, an interrupt processing program is automatically
executed.
Interrupt by µDMA/Extended intelligent I/O service (EI
❍ Exception processing
Exception processing is basically the same with interrupts.
interrupting normal processing at the instruction boundary if exception event (execution of
undefined instruction) generation is detected. Exception processing is equivalent to software
interrupt instruction "INT10".
42
2
OS)
2
OS)
2
OS) is a function used to automatically transfer data
2
OS) is a type of hardware interrupts.
Exceptions are handled by