ST7LITE20F2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7LITE20F2

8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

STMicroelectronics 

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Interrupts

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

External interrupt selection register (EISR)

Read/Write

Reset Value: 0000 1100 (0Ch)

7

IS31

IS30

IS21

IS20

IS11

IS10

IS01

0

IS00

● 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 according to the table below.

Table 14. External interrupt I/O pin selection

ei31

ei30

0

0

0

1

1

0

1. Reset state

I/O pin

PB0 (1)

PB1

PB2

● 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 according to the table below.

Table 15. External interrupt I/O pin selection

ei21

ei20

0

0

0

1

1

0

1

1

1. Reset state

2. PB4 cannot be used as an external interrupt in HALT mode.

I/O pin

PB3 (1)

PB4 (2)

PB5

PB6

● Bit 3:2 = ei1[1:0] ei1 pin selection

These bits are written by software. They select the Port A I/O pin used for the ei1

external interrupt according to the table below.

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Doc ID 8349 Rev 5

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