4.3.1 Determining the bitfield and register location for
configuring a particular interrupt
Suppose you need to configure the low-power timer (LPTMR) interrupt. The following
table is an excerpt of the LPTMR row from
(value number
as example only).
Table 4-3. LPTMR interrupt vector assignment (example only)
Address
Vector
NVIC
non-IPR
register
number
NVIC IPR
register
Source module
Source description
0x0000_0128
74
58
1
14
Low Power Timer
—
1. Indicates the NVIC's interrupt source number.
2. Indicates the NVIC's ISER, ICER, ISPR, ICPR, and IABR register number used for this IRQ. The equation to calculate this
value is: IRQ div 32
3. Indicates the NVIC's IPR register number used for this IRQ. The equation to calculate this value is: IRQ div 4
• The NVIC registers you would use to configure the interrupt are:
• NVIC_ISER1
• NVIC_ICER1
• NVIC_ISPR1
• NVIC_ICPR1
• NVIC_IABR1
• NVIC_IPR14
• To determine the particular IRQ's bitfield location within these particular registers:
• NVIC_ISER1, NVIC_ICER1, NVIC_ISPR1, NVIC_ICPR1, NVIC_IABR1 bit
location = IRQ mod 32 = 26
• NVIC_IPR14 bitfield starting location = 8 × (IRQ mod 4) + 4 = 20
Since the NVIC_IPR bitfields are 4-bit wide (
), the
NVIC_IPR14 bitfield range is 20-23
Therefore, the following bitfield locations are used to configure the LPTMR interrupts:
• NVIC_ISER1[26]
• NVIC_ICER1[26]
• NVIC_ISPR1[26]
• NVIC_ICPR1[26]
• NVIC_IABR1[26]
• NVIC_IPR14[23:20]
Interrupt channel assignments
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
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