XC886/888CLM
Interrupt System
User’s Manual
5-13
V1.3, 2010-02
Interrupt System, V 1.0
5.3
Interrupt Priority
An interrupt that is currently being serviced can only be interrupted by a higher-priority
interrupt, but not by another interrupt of the same or lower priority. Hence, an interrupt of
the highest priority cannot be interrupted by any other interrupt request.
If two or more requests of different priority levels are received simultaneously, the
request with the highest priority is serviced first. If requests of the same priority are
received simultaneously, an internal polling sequence determines which request is
serviced first. Thus, within each priority level, there is a second priority structure
determined by the polling sequence as shown in
Table 5-2
Priority Structure within Interrupt Level
Source
Level
Non-Maskable Interrupt (NMI)
(highest)
External Interrupt 0
1
Timer 0 Interrupt
2
External Interrupt 1
3
Timer 1 Interrupt
4
UART Interrupt
5
Timer 2,UART Normal Divider Overflow,
LIN, MultiCAN Interrupt
6
ADC, MultiCAN Interrupt
7
SSC Interrupt
8
External Interrupt 2, Timer 21, UART1,
UART1 Normal Divider Overflow,
CORDIC, MDU Interrupt
9
External Interrupt [6:3], MultiCAN
10
CCU6 Interrupt Node Pointer 0, MultiCAN
Interrupt
11
CCU6 Interrupt Node Pointer 1, MultiCAN
Interrupt
12
CCU6 Interrupt Node Pointer 2, MultiCAN
Interrupt
13
CCU6 Interrupt Node Pointer 3, MultiCAN
Interrupt
14
*
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