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6.6 EI
OS Interrupt
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EI
OS is a function to perform auto data transfer between the resources (I/O) and memory. It generates the
hardware interrupt at termination of data transfer.
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n EI
OS
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EI
OS is a kind of hardware interrupt. It performs auto data transfer between resources (I/O) and memory.
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EI
OS performs data exchange with resources (I/O) like DMA (direct memory access) that has been
performed conventionally using the interrupt processing program, and automatically branches to the
interrupt-processing routine after setting the termination conditions. The user needs create the program at
start and termination of EI
• Advantages of EI
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OS
Compared to data transfer using the interrupt-processing routine, EI
– Since describing program for data transfer is not required, the program size can be reduced.
– Since data transfer can be stopped according to the state of the resource (I/O), transfer of unnecessary
data is not required.
– 'No increment nor update' can be selected for the buffer address.
– 'No increment nor update' can be selected for the I/O register address.
• Termination interrupt by EI
When data transfer by EI
control register to branch to the interrupt-processing routine automatically.
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The EI
OS termination factor can be determined by checking the EI
interrupt processing program.
The interrupt number and interrupt vector are fixed at each resource. For details, see Section 6.2.
• Interrupt control register (ICR)
This register is within the interrupt controller, and displays the states at starting, specifying channel, and
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terminating the EI
OS.
• EI
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OS descriptor (ISD)
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The EI
OS descriptors at 000100
mode, I/O address, transfer count, and buffer addresses. These are provided for 16 channels. The each
channel is specified at interrupt controller register (ICR).
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Note:
When EI
OS is operating, program execution by the CPU is stopped.
INTERRUPT
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OS, and needs not create the data transfer program.
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OS
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OS terminates, termination conditions are set to S1 and S0 of the interrupt
to 00017F
H
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OS has the following advantages.
in RAM is consist of 8-byte data containing the transfer
H
6-23
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OS status (ICR: S1, S0) using the
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