ST7PLIT110BF0M3 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PLIT110BF0M3

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, 5 TIMERS, SPI

STMicroelectronics 

ST7LITE1xB

INTERRUPTS (Cont’d)

EXTERNAL INTERRUPT CONTROL REGISTER

(EICR)

Read / Write

Reset Value: 0000 0000 (00h)

7

0

IS31 IS30 IS21 IS20 IS11 IS10 IS01 IS00

EXTERNAL INTERRUPT SELECTION REGIS-

TER (EISR)

Read / Write

Reset Value: 0000 1100 (0Ch)

7

0

ei31 ei30 ei21 ei20 ei11 ei10 ei01 ei00

Bits 7:6 = IS3[1:0] ei3 sensitivity

These bits define the interrupt sensitivity for ei3

(Port B0) according to Table 6.

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

These bits define the interrupt sensitivity for ei2

(Port B3) according to Table 6.

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

These bits define the interrupt sensitivity for ei1

(Port A7) according to Table 6.

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

These bits define the interrupt sensitivity for ei0

(Port A0) according to Table 6.

Notes:

1. These 8 bits can be written only when the I bit in

the CC register is set.

2. 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” on

page 48.

Table 6. Interrupt Sensitivity Bits

ISx1 ISx0

00

01

10

11

External Interrupt Sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

Bits 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

ei31

ei30

0

0

0

1

1

0

I/O Pin

PB0 1)

PB1

PB2

Note:

1. Reset State

Bits 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

ei21

ei20

0

0

0

1

1

0

1

1

I/O Pin

PB3 1)

PB4 2)

PB5

PB6

Notes:

1. Reset State

2. PB4 cannot be used as an external interrupt in

HALT mode.

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