ST7LITE25F2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7LITE25F2

8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

STMicroelectronics 

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Interrupts

External interrupt control register (EICR)

Read/Write

Reset Value: 0000 0000 (00h)

7

IS31

IS30

IS21

IS20

IS11

IS10

IS01

0

IS00

Note:

● 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.

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.

Table 13.

ISx1

0

0

1

1

Interrupt sensitivity bits

ISx0

0

1

0

1

External interrupt sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

Doc ID 8349 Rev 5

49/166

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