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dsPIC30F2010
DS70118J-page 38
2011 Microchip Technology Inc.
5.1
Interrupt Priority
The user-assignable Interrupt Priority (IP<2:0>) bits for
each individual interrupt source are located in the Least
Significant 3 bits of each nibble, within the IPCx regis-
ter(s). Bit 3 of each nibble is not used and is read as a
‘0’. These bits define the priority level assigned to a
particular interrupt by the user.
Since more than one interrupt request source may be
assigned to a specific user-assigned priority level, a
means is provided to assign priority within a given level.
This method is called “Natural Order Priority” and is
final.
Natural Order Priority is determined by the position of
an interrupt in the vector table, and only affects
interrupt operation when multiple interrupts with the
same user-assigned priority become pending at the
same time.
Table 5-1 lists the interrupt numbers and interrupt
sources for the dsPIC DSC devices and their
associated vector numbers.
The ability for the user to assign every interrupt to one
of seven priority levels means that the user can assign
a very high overall priority level to an interrupt with a
low natural order priority. For example, the PLVD (Low-
Voltage Detect) can be given a priority of 7. The INT0
(external interrupt 0) may be assigned to priority
level 1, thus giving it a very low effective priority.
TABLE 5-1:
dsPIC30F2010 INTERRUPT
VECTOR TABLE
Note:
The user-assigned priority levels are from
0, as the lowest priority, to level 7, as the
highest priority.
Note 1: The natural order priority scheme has 0
as the highest priority and 53 as the
lowest priority.
2: The natural order priority number is the
same as the INT number.
INT
Number
Vector
Number
Interrupt Source
Highest Natural Order Priority
0
8
INT0 – External Interrupt 0
1
9
IC1 – Input Capture 1
2
10
OC1 – Output Compare 1
3
11
T1 – Timer1
4
12
IC2 – Input Capture 2
5
13
OC2 – Output Compare 2
6
14
T2 – Timer2
7
15
T3 – Timer3
8
16
SPI1
9
17
U1RX – UART1 Receiver
10
18
U1TX – UART1 Transmitter
11
19
ADC – ADC Convert Done
12
20
NVM – NVM Write Complete
13
21
SI2C – I2C Slave Interrupt
14
22
MI2C – I2C Master Interrupt
15
23
Input Change Interrupt
16
24
INT1 – External Interrupt 1
17
25
IC7 – Input Capture 7
18
26
IC8 – Input Capture 8
19
27
Reserved
20
28
Reserved
21
29
Reserved
22
30
Reserved
23
31
INT2 - External Interrupt 2
24
32
Reserved
25
33
Reserved
26
34
Reserved
27
35
Reserved
28
36
Reserved
29
37
Reserved
30
38
Reserved
31
39
Reserved
32
40
Reserved
33
41
Reserved
34
42
Reserved
35
43
Reserved
36
44
INT3 – External Interrupt 3
37
45
Reserved
38
46
Reserved
39
47
PWM – PWM Period Match
40
48
QEI – QEI Interrupt
41
49
Reserved
42
50
Reserved
43
51
FLTA – PWM Fault A
44
52
Reserved
45-53
53-61
Reserved
Lowest Natural Order Priority
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