ST7FLITE25F2M6 datasheet(49/166 Pages) STMICROELECTRONICS

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Interrupts

Doc ID 8349 Rev 5

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External interrupt control register (EICR)

Read/Write

Reset Value: 0000 0000 (00h)

●

Bit 7:6 =

IS3[1:0] ei3 sensitivity

These bits define the interrupt sensitivity for ei3 (Port B0) according to Table 13:

Interrupt sensitivity bits.

●

Bit 5:4 =

IS2[1:0] ei2 sensitivity

These bits define the interrupt sensitivity for ei2 (Port B3) according to Table 13:

Interrupt sensitivity bits.

●

Bit 3:2 =

IS1[1:0] ei1 sensitivity

These bits define the interrupt sensitivity for ei1 (Port A7) according to Table 13:

Interrupt sensitivity bits.

●

Bit 1:0 =

IS0[1:0] ei0 sensitivity

These bits define the interrupt sensitivity for ei0 (Port A0) according to Table 13:

Interrupt sensitivity bits.

Note:

These 8 bits can be written only when the I bit in the CC register is set.

Changing the sensitivity of a particular external interrupt clears this pending interrupt. This

can be used to clear unwanted pending interrupts. Refer to Section : External interrupt

function.

IS31

IS30

IS21

IS20

IS11

IS10

IS01

IS00

Table 13.

Interrupt sensitivity bits

ISx1

ISx0

External interrupt sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

ST7FLITE25F2M6 Datasheet(PDF) 49 Page - STMicroelectronics

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