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HMCS404AC--------------------------------------------------------------------------
$000.0
lIE
I - - - - - - - - - - - - - r ,
Sequence Control
· Push PCtCA/ST
$001.0
$001.2
$003.0
· Rese.
IIf
· Jump to Vector
Address
Priority Control
PLA
Fig.6 Interrupt Circuit Block Diagram
Table 1. Vector Addresses and I nterrupt Priority
Reset, Interrupt
Priority
Vector addresses
RESET
-
$0000
INTo
1
$0002
INTI
2
$0004
TIMER-A
3
$0006
TIMER-B
4
$0008
SERIAL
5
$OOOC
Table 2. Conditions of Interrupt Service
Address
~
Interrupt
source
INTo
INTI
TIMER-A
TIMER-B
control bits
I/E
1
1
1
1
IFO·IMO
1
0
0
0
IF1 ·IM1
*
1
0
0
IFTA ·IMTA
*
*
1
0
IFT-B· IMTB
*
*
*
1
IFS ·IMS
*
*
*
*
310
SERIAL
1
0
0
0
0
1
• Don't care
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