BLUENRG-2 datasheet(152/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

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DocID030675 Rev 2

Bit

Field name

Reset

Description

ADDERR_EN

AHB address error interrupt enable.



0: interrupt disabled.



1: interrupt enabled.

31:4

RESERVED

3.20

TX/RX event alert

The BlueNRG-2 is provided with the ANATEST1 (pin 14 for QFN32 package, pin 24 for

QFN32 package and pin D4 for WCSP34 package) signal which alerts forthcoming

transmission or reception event. ANATEST1 switches to high level about 100 µs before

BlueNRG-2 starts to transmit or receive and switches to low level at the end of the event.

The signal can be used for controlling external antenna switching and supporting

coexistence with other wireless technologies.

3.21

SWD debug feature

The BlueNRG-2 embeds the ARM serial wire debug (SWD) port. It is two pins (clock and

single bi-directional data) debug interface, providing all the debug functionality plus real-

time access to system memory without halting the processor or requiring any target

resident code.

Table 209: SWD port

Pin functionality

Pin name

Pin description

SWCLK

IO9

SWD clock signal

SWDIO

IO10

SWD data signal

The Cortex-M0 subsystem of the BlueNRG-2 embeds four breakpoints and two

watchpoints.

3.21.1

Debugging tips

There are certain situations where debug access is disabled and the chip cannot be

accessed, including:



application that disables debug pins



application that set the device in sleep or standby state, in which the debug port is not

powered.

These cases are common during application development and device can end up in a state

where debug access is no longer possible. To recover this situation, it is recommended to

force IO7 pin high and hardware reset the device in order to force execution of the updater

code (see Section 3.23: "Pre-programmed bootloader"). The user can then connect with

SWD interface and erase the device Flash memory.

3.22

Bluetooth low energy radio

The BlueNRG-2 integrates a RF transceiver compliant to the Bluetooth specification and to

the standard national regulations in the unlicensed 2.4 GHz ISM band.

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