Fujitsu F2MC-16LX Hardware Manual page 65

Software interrupt
Transfers control to the user-defined interrupt handing program by executing the instruction dedicated to
software interrupt (for example, INT instruction).
Figure 3.1-2 Overview of Software Interrupts
Register file
Microcode
F 2 MC-16LX CPU
Save
Interrupts by extended intelligent I/O service (EI
2
EI OS is involved in automatic data transfer between peripheral functions and memory. EI
of performing data transfer like DMA (direct memory access) although it was previously performed by the
interrupt handling program. Once the data transfer process has been performed the specified number of
2
times, EI OS automatically executes the interrupt handling program.
2
Interruption by EI OS is a type of hardware interrupt.
Figure 3.1-3 Overview of the Extended Intelligent I/O Service (EI
by IOA
CPU
by BAP
PS I
IR
Queue
Instruction bus
RAM
2
OS)
Memory space
I/O register
by ICS
ISD
by DCT
Buffer
CHAPTER 3 INTERRUPT
S ILM
PS : Processor status
I : Interrupt enable flag
B unit ILM : Interrupt level mask register
IR : Instruction register
B unit : Bus interface unit
Fetch
2
Peripheral
I/O register
Interrupt request
Interrupt control register
Interrupt controller
I/O requests transfer
The interrupt controller selects the
descriptor.
The transfer source and destination
are read from the descriptor.
Data is iransferred between I/O and
memory.
2
OS is capable
OS)
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