Sharp MZ-5500 Tehnical Manual page 34

ii) Software
The following procedure is required when interrupt is processed using the
machine language.
IY\terrupt
proce~)iVLj rOi.ltiV1~
~1o.lt'\
loutj'ne..
0\ ~& ~
~-Q.'h
,
i\~'\~~
' I o. . ,\'(\1J.­
~~ ()\~ ' ~ '{~iV.'
'Wa.il
~r-j\,«
1vp .Jress
0+
-the old
/J
. ih\~
inre\Tupt proc.ess;n~ rou1ine
~~
Se· t
to
fu
-top
acldre5s
~tM
inierrupt . ' .
prou~'h; t\l.~
routi0e.. ' . / . .
.J"tertUpt!juJ1<1li1e.rt
(.leoy 1ttl
~sLl
A
Vntl'7~
I k I .
, • .
"terrur~ 0.(
'How
€ ' c{je..
• Issu~
tb
fO[
comMllluJ
~l\1qA
IRE
T
. ~ the
· )et -to
t\~
:top
OdJ;Q5S
of
-tt~
,
olJ
1~1errupt pnx:es5;~
nxrltne
~
- - - - - - - - _I
. t
For theMZ-5500/5600, the following müdes are assjgned to the 8259A
PICo
Für more details, refer to the 8259A specifieation sheet.
°Level trigger mode
0: 100H
r - - - - - - ,
08086 mode
Offset
}IR-O
°Normal EOI Segment
~ Free
nested mode
JIR-I
~
0:100H+4*13
~
Interrupt routine 'programming mode
(1) Interrupt addre~s designation
The top address of the interrupt processing routine must be assigned at
the .start of the main routine. As shown in the fjgure right, the top
address of eaeh interrupt routine ean be set in sequence from "segment 0:
offset: 100H". The top address of the interrupt routine for the IR-25
must be
written in 13th address.
Segment 0:
Offset 100H+4*13
Before writing the address, be sure to save the address previously
writt~n.
31