BLUENRG-2 datasheet(97/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

DocID030675 Rev 2

97/190

Bit

Field name

Reset

Description

6:4

CAUSE

0x0

Abort cause. This field is valid only when the STATUS field

contains the ABORT tag. Others: RESERVED.

000b: NACK_ADDR: The master receives a not-acknowledge

after the transmission of the address. Valid for the operation

MW, MR.

001b: NACK_DATA: The master receives a not-acknowledge

during the data phase of a MW operation. Valid for the

operation MW.

011b: ARB_LOST: The master loses the arbitration during a

MW or MR operation. Valid for the operation MW, MR.

100b: BERR_START: Slave restarts, a START Condition

occurs while the byte transfer is not terminated.

101b: BERR_STOP: Slave Reset, a STOP Condition while the

byte transfer is not terminated.

110b: OVFL: The slave receives a frame related to the WTS

operation longer than the maximum size = 2047 bytes. In this

case the slave device returns a NACK to complete the data

transfer. Valid for WTS operation

8:7

TYPE

0x0

Receive type. Valid only for the operation WTS:

00b: FRAME: The slave has received a normal frame.

01b: GCALL: The slave has received a general call. If the it

I2C_CR:SGCM is set to 1, the general call is directly executed

without software intervention and only the control code word is

reported in FIFO (LENGTH =0).

10b: HW_GCALL: The slave has received a hardware general

call.

19:9

LENGTH

0x0

Transfer length. For an MR, WTS operation the LENGTH field

defines the actual size of the subsequent payload, in terms of

number of bytes. For an MW, RFS operation the LENGTH

field defines the actual number of bytes transferred by the

master/slave device. For a WTS operation if the transfer

length exceeds 2047 bytes, the operation is stopped by the

slave returning a NACK handshake and the flag OVFL is set.

For an RFS operation if the transfer length exceeds 2047

bytes, the operation continues normally but the LENGTH field

is Reset to 0.

28:

RESERVED

0x0

RESERVED

DUALF

0x0

Dual flag (slave mode):

0: Received address matched with slave address (SA7).

1: Received address matched with dual slave address

(DSA7).

Cleared by hardware after a Stop condition or repeated Start

condition, bus error or when PE=0.

31:30

RESERVED

0x0

RESERVED

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