Hitachi AP1 - Page 350

HMCS404CL--------------------------------------------------------------------------
$ 000.0
liE t-------------{---...
Sequence ContrOl
· Push PCICA/ST
$00'.2
$ 003.0
· 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 1 $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
1
1 1
1
IFO·IMO
1
0 0 0
IF1 ·IM1
*
1 0
0
IFTA
·IMTA
*
*
1
0
IFTB·IMTB
*
* *
1
IFS ·IMS
*
*
* *
348
SERIAL
1
0
0
0
0
1
* Don't care