ST7LITE2 datasheet(36/131 Pages) STMICROELECTRONICS

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ST7LITE2

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INTERRUPTS (Cont’d)

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 6.

Bit 5:4 = IS2[1:0]

ei2 sensitivity

These bits define the interrupt sensitivity for ei2

(Port B3) according to Table 6.

Bit 3:2 = IS1[1:0]

ei1 sensitivity

These bits define the interrupt sensitivity for ei1

(Port A7) according to Table 6.

Bit 1:0 = IS0[1:0]

ei0 sensitivity

These bits define the interrupt sensitivity for ei0

(Port A0) according to Table 6.

Note: These 8 bits can be written only when the I

bit in the CC register is set.

Table 6. Interrupt Sensitivity Bits

EXTERNAL INTERRUPT SELECTION REGIS-

TER (EISR)

Read /Write

Reset Value: 0000 1100 (0Ch)

Bit 7:6 = ei3[1:0]

ei3 pin selection

These bits are written by software. They select the

Port B I/O pin used for the ei3 external interrupt ac-

cording to the table below.

External Interrupt I/O pin selection

* Reset State

Bit 5:4 = ei2[1:0]

ei2 pin selection

These bits are written by software. They select the

Port B I/O pin used for the ei2 external interrupt ac-

cording to the table below.

External Interrupt I/O pin selection

* Reset State

IS31

IS30

IS21

IS20

IS11

IS10

IS01

IS00

ISx1 ISx0

External Interrupt Sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

ei31

ei30

ei21

ei20

ei11

ei10

ei01

ei00

ei31

ei30

I/O Pin

PB0 *

PB1

PB2

ei21

ei20

I/O Pin

PB3 *

PB4

PB5

PB6

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