Intel 8XC196NT User Manual page 525

8XC196NT USER'S MANUAL
EPAIPV
EPAIPV
When an EPA x interrupt occurs, the EPA interrupt priority vector (EPAIPV) register contains a number
that identifies the highest priority, active, multiplexed interrupt source (see Table 10-6).
EPAIPV allows software to branch via the TIJMP instruction to the correct interrupt service routine
when EPA x is activated. Reading EPAIPV clears the EPA pending bit for the interrupt associated with
the value in EPAIPV. When all the EPA pending bits are cleared, the EPA x pending bit is also cleared.
7
— —
Bit Bit
Number Mnemonic
5:7 —
4:0 PV4:0
Value Interrupt
14H
13H
12H
11H
10H
0FH
0EH
C-30
— PV4
Reserved; always write as zeros.
Priority Vector
These bits contain a number from 01H to 14H corresponding to the
highest-priority active interrupt source. This value, when used with the
TIJMP instruction, allows software to branch to the correct interrupt
service routine.
Table C-7. EPA Interrupt Priority Vectors
Value
EPA4 0DH
EPA5 0CH
EPA6 0BH
EPA7 0AH
EPA8 09H
EPA9 08H
OVR0 07H
PV3 PV2
Function
Interrupt Value
OVR1 06H
OVR2 05H
OVR3 04H
OVR4 03H
OVR5 02H
OVR6 01H
OVR7 00H
Address: 1FA8H
Reset State: 00H
0
PV1 PV0
Interrupt
OVR8
OVR9
COMP0
COMP1
OVRTM1
OVRTM2
None