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CHAPTER 3 CPU
3.5.14
Procedure for Use of EI
The procedure for using the EI
I Procedure for Use of EI
Setting of system stack area
Setting of EI
Setting of peripheral resource interruption
Setting of interrupt
control register(ICR)
Setting the start
operation of resource
and interrupt enable bit
Execution of user program
Resetting of
intelligent I/O Service
(Switching channels)
Data processing during buffer
ISE
: Enable bit EI
2
S1, S0 : EI
OS status (ICR)
86
2
OS is shown below:
2
OS
Figure 3.5-16 Procedure for Use of EI
Processing by software
Start
2
OS Descriptor
Setting ILM, I in PS
(transfer to interrupt processing)
RETI
2
OS (ICR)
2
OS
2
OS
Processing by hardware
(Interrupt request) and (ISE=1)
Data transfer
Transfer termination of specified
number or Identification of transfer
to interrupt by termination
request from peripheral resources
S1, S0="01
S1, S0="11
S1, S0="00
"
B
NO
YES
"or
B
"
B
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