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6.3.1. Interrupt Controller Type Register, ICTR

The ICTR characteristics are:


Shows the number of interrupt lines that the NVIC supports.

Usage Constraints

There are no usage constraints.


This register is available in all processor configurations.


See the register summary in Table 6.1.

Figure 6.1 shows the ICTR bit assignments.

Figure 6.1. ICTR bit assignments

Figure 6.1. ICTR bit assignments

Table 6.2 shows the ICTR bit assignments.

Table 6.2. ICTR bit assignments
Bits Name Function

Total number of interrupt lines in groups of 32:

b0000 = 0...32

b0001 = 33...64

b0010 = 65...96

b0011 = 97...128

b0100 = 129...160

b0101 = 161...192

b0110 = 193...224

b0111 = 225...256[a]

[a] The processor supports a maximum of 240 external interrupts.

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