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4.2.1 Interrupt priority levels
The NVIC on this device supports 4 interrupt priority levels. Therefore, the NVIC_IPR
registers contains 2 bits for each interrupt request (IRQ). For example, NVIC_IPR0 is
shown below:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
IRQ3
0 0 0 0 0 0
IRQ2
0 0 0 0 0 0
IRQ1
0 0 0 0 0 0
IRQ0
0 0 0 0 0 0
W
4.2.2 Non-maskable interrupt
This device supports non-maskable interrupt (NMI) to the NVIC. It is controlled by the
external NMI signal from the pin. The pin which the NMI signal is multiplexed on, must
be configured for the NMI function to generate the non-maskable interrupt request.
4.3 Interrupt channel assignments
The interrupt source assignments are defined in the following table.
• Vector number — the value stored on the stack when an interrupt is serviced.
• IRQ number — non-core interrupt source count, which is the vector number minus
16.
The IRQ number is used within ARM's NVIC documentation.
Table 4-2. Interrupt vector assignments
Address
Vector
NVIC
IPR
register
number
Source module
Source description
ARM Core System Handler Vectors
0x0000_0000
0
–
–
ARM core
Initial Stack Pointer
0x0000_0004
1
–
–
ARM core
Initial Program Counter
0x0000_0008
2
–
–
ARM core
Non-maskable Interrupt (NMI)
0x0000_000C
3
–
–
ARM core
Hard Fault
0x0000_0010
4
–
–
—
—
0x0000_0014
5
–
–
—
—
0x0000_0018
6
–
–
—
—
0x0000_001C
7
–
–
—
—
Table continues on the next page...
Interrupt channel assignments
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
58
NXP Semiconductors
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