ST7LITE49M datasheet(58/188 Pages) STMICROELECTRONICS

Part #	ST7LITE49M

Description	8-bit MCU with single voltage Flash memory data EEPROM, ADC, 8/12-bit timers, and I²C interface

PDF	188 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Interrupts

ST7LITE49M

58/188

8.5.3

External Interrupt Control register (EICR)

Reset value: 0000 0000 (00h)

Bits 7:6 = Reserved, must be kept cleared.

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

These bits define the interrupt sensitivity for ei2 (Port C) according to Table 18.

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

These bits define the interrupt sensitivity for ei1 (Port B) according to Table 18.

Bits 1:0 = IS0[1:0] ei0 sensitivity bits

These bits define the interrupt sensitivity for ei0 (Port A) according to Table 18.

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.

IS21

IS20

IS11

IS10

IS01

IS00

Read/write

Table 18.

Interrupt sensitivity bits

ISx1

ISx0

External interrupt sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

ST7LITE49M Datasheet(PDF) 58 Page - STMicroelectronics