ST7MC1K2 datasheet(68/371 Pages) STMICROELECTRONICS

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Interrupts

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

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7.7.2

External interrupt control register (EICR)

EICR

Reset value: 0000 0000 (00h)

654

IS1[1:0]

IPB

IS2[1:0]

IS3[1:0]

IPA

R/W

Table 20.

EICR register description

Bit

Name

Function

7:6 IS1[1:0]

Interrupt sensitivity (ei2 sensitivity)

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

external interrupts:

External interrupt ei2 (port C[3:2]):

00: External interrupt sensitivity = falling edge and low level (IPB bit = 0)

and rising edge and high level (IPB bit = 1)

01: External interrupt sensitivity = rising edge only (IPB bit = 0)

and falling edge only (IPB bit = 1)

10: External interrupt sensitivity = falling edge only (IPB bit = 0)

and rising edge only (IPB bit = 1)

11: External interrupt sensitivity = rising and falling edge (IPB bit = 0 and IPB bit = 1)

External interrupt ei2 (port B[7:6]):

00: External interrupt sensitivity = falling edge and low level

01: External interrupt sensitivity = rising edge only

10: External interrupt sensitivity = falling edge only

11: External interrupt sensitivity = rising and falling edge

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

(level 3).

5IPB

Interrupt polarity (for port C)

This bit is used to invert the sensitivity of port C[3:2] external interrupts. It can be set

and cleared by software only when I1 and I0 of the CC register are both set to 1

(level 3).

0: No sensitivity inversion

1: Sensitivity inversion

4:3 IS2[1:0]

Interrupt sensitivity (ei1 sensitivity)

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

external interrupts:

External interrupt ei1 (port A3 and A5):

00: External interrupt sensitivity = falling edge and low level

01: External interrupt sensitivity = rising edge only

10: External interrupt sensitivity = falling edge only

11: External interrupt sensitivity = rising and falling edge

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