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Interrupts

ST72561-Auto

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Doc ID 12370 Rev 8

6.6.2

External interrupt control register 0 (EICR0)

Read/Write

Reset value: 0000 0000 (00h)

Bits 7:6 = IS3[1:0] ei3 sensitivity

The interrupt sensitivity, defined using the IS3[1:0] bits, is applied to the ei3 external

interrupts:

These 2 bits can be written only when I1 and I0 of the CC register are both set to 1 (level 3).

Bits 5:4 = IS2[1:0] ei2 sensitivity

The interrupt sensitivity, defined using the IS2[1:0] bits, is applied to the ei2 external

interrupts:

These 2 bits can be written only when I1 and I0 of the CC register are both set to 1 (level 3).

Bits 3:2 = IS1[1:0] ei1 sensitivity

The interrupt sensitivity, defined using the IS1[1:0] bits, is applied to the ei1 external

interrupts:

IS31

IS30

IS21

IS20

IS11

IS10

IS01

IS00

Table 17.

Interrupt sensitivity - ei3

IS31

IS30

External interrupt sensitivity

Falling edge and low level

Rising edge only

Falling edge only

Rising and falling edge

Table 18.

Interrupt sensitivity - ei2

IS21

IS20

External interrupt sensitivity

Falling edge and low level

Rising edge only

Falling edge only

Rising and falling edge

Table 19.

Interrupt sensitivity - ei1

IS11

IS10

External interrupt sensitivity

Falling edge and low level

Rising edge only

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