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----------------------------------------------------------------HMCS404C
1000.0
IEr-------------------__
-1~
Sequence Conlrol
· Pu'" PC CA ST
1001.0
1001.2
1003.0
· Reset Ilf
· Jump to Vector
Address
Priority Control
PLA
Fig.6 Interrupt Circuit Block Diagram
Table 1. Vector Addresses and Interrupt Priority
Reset, Interrupt
Priority
Vector addresses
RESET
-
$0000
INTo
,
$0002
INT,
2
$0004
TIMER-A
3
$0006
TIMER-B
4
$0008
SERIAL
5
$OOOC
Table 2. Conditions of Interrupt Service
~
Interrupt
source
INTo
INT,
TIMER-A
TlMER-B
control bits
I/E
,
,
,
,
IFO·IMO
1
0
0
0
IF1 ·IM1
*
,
0
0
IFTA ·IMTA
*
*
1
0
IHS ·IMTB
*
*
*
1
IFS ·IMS
*
*
*
*
235
SERIAL
1
0
0
0
0
1
• Don't
care
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