Mitsubishi DS5000TK User's Guide download pdf (Page 95)

USER’S GUIDE

050396 94/173

cycle. If the interrupt acknowledge does not take place

for one of the reasons cited above, the request flag will

become subsequently inactive and the interrupt will

have been lost and will not be serviced.

When an interrupt request is acknowledged, a long call

is executed to the interrupt vector location and the

2–byte return address is pushed onto the stack. In addi-

tion, an internal flag is set which indicates to the hard-

ware the interrupt source that is being serviced. Execu-

tion then proceeds from the interrupt vector location. At

the conclusion of the interrupt service routine, an RETI

instruction should be performed to return control to the

main program. The RETI performs the same action as a

RET instruction in terms of its operation on the stack and

the Program Counter. In other words, two bytes of return

address are popped off the stack and loaded into the

Program Counter. However, the RETI performs the

additional operation of clearing the interrupt–in–service

flag to inform the hardware that a service routine is no

longer in progress. Therefore, an RETI should always

be used to terminate an interrupt service routine. Failure

to do so would indicate that the interrupt was still being

serviced.

Higher priority interrupts, which are enabled, can inter-

rupt lower priority interrupts. According to this rule, a

higher priority interrupt could become pending just prior

to machine cycle IA3 during an interrupt acknowledge of

a lower priority interrupt. This would cause the hardware

to vector to the higher priority service routine during the

two machine cycles just after the long call to the lower

priority interrupt so that no instruction within the lower

priority interrupt service routine would have been

executed.

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