Fujitsu MB90335 Series Hardware Manual page 68

MB90335 Series
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Software interrupt
Transfers control to the user-defined interrupt handing program by executing the instruction dedicated to
software interrupt (for example, INT instruction).
F 2 MC-16LX CPU
Save
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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
times, EI
Interruption by EI
Figure 3.1-3 Overview of the Extended Intelligent I/O Service (EI
CPU
CM44-10137-6E
Figure 3.1-2 Overview of Software Interrupts
Register file
Microcode
IR
RAM
2
OS automatically executes the interrupt handling program.
2
OS is a type of hardware interrupt.
Memory space
by IOA
I/O register
ISD
by BAP
Buffer
FUJITSU MICROELECTRONICS LIMITED
PS I ILM
B unit
Queue Fetch
Instruction bus
2
OS)
I/O register
Interrupt request
by ICS
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.
by DCT
Data is transferred between I/O and
memory.
CHAPTER 3 INTERRUPT
3.1 Outline of Interrupt
PS : Processor status
I : Interrupt enable flag
ILM : Interrupt level mask register
IR : Instruction register
B unit : Bus interface unit
2
OS is capable
2
OS)
Peripheral
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