Procedure For Using The Extended Intelligent I/O Service (Ei 2 Os) - Fujitsu MB90460 Series Hardware Manual

CHAPTER 7 INTERRUPT
7.6.4 Procedure for using the Extended Intelligent I/O Service
2
(EI OS)
Before the extended intelligent I/O service (EI
extended intelligent I/O service (EI
control register (ICR) must be set.
■ Procedure for using the Extended Intelligent I/O Service (EI
Figure 7.6-8 shows the EI
Figure 7.6-8 Procedure for using the Extended Intelligent I/O Service (EI
Initializa-
tion
2
ISE: EI OS enable bit in the interrupt control register (ICR)
S1, S0: EI
146
2
OS) descriptor, interrupt function, and interrupt
2
OS software and hardware processing.
Software processing
Start
Set the system stack area
2
Set the EI OS descriptor
Initialize the peripheral
function
Set the interrupt control
register (ICR)
Set the built-in resource to
start operation. Set the
interrupt enable bit
Set the ILM and I in the PS
Execute the user program
(Branch to interrupt vector)
Set the extended intelligent
I/O service again (switch
channels)
Process data in the buffer
RETI
2
OS status of the interrupt control register (ICR)
2
OS) an be used, the system stack area,
2
OS)
Hardware processing
(Interrupt request)
S1, S0 = 00
and (ISE = 1)
Transfer data
Decide whether to end
counting or to branch to an
interrupt requested by the
resource
YES
S1, S0 = 01 or
S1, S0 = 11
2
OS)
NO