BLUENRG-2 datasheet(115/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

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3.12.2.1

GPIO interrupts

Each IO in GPIO mode can be used as interrupt source from external signal. The trigger

event is both edge and level sensitive according to configuration. All the configuration are

reported in table below.

Table 135: GPIO interrupt modes

Configuration

Interrupt mode

Falling edge

Rising edge

Both edges

Low level

High level

IOIS

IOIBE

IOIEV

The interrupt is enabled by writing 1 in the IO_MIS register, in the position with same

number of the IO desired. Once the interrupt occurs, it can be cleared by writing 1 in the

IO_IC register. All the interrupts drive a single interrupt signal of the NVIC.

3.12.2.2

GPIO characteristics

By default all the GPIO pins are configured as input with related pull-up or pull-down

resistor enabled according to table below.

Table 136: Pin characteristics

Name

Type

Buffer strength(1)

Pull-up / pull-down

availability

Reset state

Default state

IO0

I/O

High / Very High

drive

Pull-down

Input pull-

down

GPIO mode

IO1

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO2

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO3

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO4

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO5

I/O

High / Very High

drive

Pull-down

Input pull-

down

GPIO mode

IO6

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO7

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO8

I/O

Low / High drive

Pull-down

Input pull-

down

GPIO mode

IO9

I/O

High / Very High

drive

Pull- up

Input pull-up

Mode serial1

(SWCLK)

IO10

I/O

Low / High drive

Pull- up

Input pull-up

Mode serial1

(SWDIO)

IO11

I/O

Low / High drive

Pull-up

Input pull-up

GPIO mode

IO12

10 mA

No pull

Input

GPIO mode

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