ST7232AK1B1 Datasheet

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ST7232A

INTERRUPTS

(Cont鈥檇)

7.7 EXTERNAL INTERRUPT CONTROL REGISTER (EICR)

Read/Write

Reset Value: 0000 0000 (00h)

7

IS11

IS10

IPB

IS21

IS20

IPA

0

0

0

Bit 4:3 =

IS2[1:0]

ei0 and ei1 sensitivity

The interrupt sensitivity, defined using the IS2[1:0]

bits, is applied to the following external interrupts:

- ei0 (port A3..0)

Bit 7:6 =

IS1[1:0]

ei2 and ei3 sensitivity

The interrupt sensitivity, defined using the IS1[1:0]

bits, is applied to the following external interrupts:

- ei2 (port B3..0)

External Interrupt Sensitivity

IS11 IS10

IPB bit =0

0

0

1

1

0

1

0

1

Falling edge &

low level

Rising edge only

Falling edge only

IPB bit =1

Rising edge

& high level

Falling edge only

Rising edge only

0

1

1

1

0

1

External Interrupt Sensitivity

IS21 IS20

IPA bit =0

0

0

Falling edge &

low level

Rising edge only

Falling edge only

IPA bit =1

Rising edge

& high level

Falling edge only

Rising edge only

Rising and falling edge

Rising and falling edge

- ei1 (port F2..0)

IS21 IS20

0

0

1

0

1

External Interrupt Sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

- ei3 (port B4)

IS11 IS10

0

0

1

1

0

1

0

1

External Interrupt Sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

0

1

1

These 2 bits can be written only when I1 and I0 of

the CC register are both set to 1 (level 3).

Bit 2 =

IPA

Interrupt polarity for port A

This bit is used to invert the sensitivity of the port A

[3:0] 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

Bits 1:0 = Reserved, must always be kept cleared.

These 2 bits can be written only when I1 and I0 of

the CC register are both set to 1 (level 3).

Bit 5 =

IPB

Interrupt polarity for port B

This bit is used to invert the sensitivity of the port B

[3:0] 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

33/154

1

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