ST7LITE20F2 datasheet(49/166 Pages) STMICROELECTRONICS

49 / 166 page

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Interrupts

Doc ID 8349 Rev 5

49/166

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 13:

Interrupt sensitivity bits.

●

Bit 5:4 =

IS2[1:0] ei2 sensitivity

These bits define the interrupt sensitivity for ei2 (Port B3) according to Table 13:

Interrupt sensitivity bits.

●

Bit 3:2 =

IS1[1:0] ei1 sensitivity

These bits define the interrupt sensitivity for ei1 (Port A7) according to Table 13:

Interrupt sensitivity bits.

●

Bit 1:0 =

IS0[1:0] ei0 sensitivity

These bits define the interrupt sensitivity for ei0 (Port A0) according to Table 13:

Interrupt sensitivity bits.

Note:

These 8 bits can be written only when the I bit in the CC register is set.

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.

IS31

IS30

IS21

IS20

IS11

IS10

IS01

IS00

Table 13.

Interrupt sensitivity bits

ISx1

ISx0

External interrupt sensitivity

Falling edge & low level

Rising edge only

Falling edge only

Rising and falling edge

ST7LITE20F2 数据表(PDF) 49 Page - STMicroelectronics

ST7LITE20F2 数据表(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

ST7LITE20F2 数据表(PDF) 49 Page - STMicroelectronics

ST7LITE20F2 数据表(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载