BLUENRG-2 datasheet(63/190 Pages) STMICROELECTRONICS

63 / 190 page

BlueNRG-2

Functional details

DocID030675 Rev 2

63/190

Bit

Field name

Reset

Description

SPO

0x0

Clock polarity (Motorola SPI format only):

0: Steady state of clock polarity is low.

1: Steady state of clock polarity is high.

SPH

0x0

Clock phase (Motorola SPI format only):

0: Steady state of clock phase is low.

1: Steady state of clock phase is high.

15:8

SCR

0x0

Serial clock rate.

The SRC value is used to generate the transmit and receive

bit rate of the SPI. The bit rate is: f_SPICLK / (CPSDVR * (1 +

SCR)), where CPSDVR is an even value from 2 to 254 and

SCR is a value from 0 to 255.

20:16

CSS

0X00

Command size select (CSS+1) defines the number of bits for

the command in MicroWire mode only:

0x00: Reserved

0x01: Reserved

0x02: Reserved

0x03: 4-bit data

0x04: 5-bit data

...

0x1F: 32-bit data

21:22

FRF

0x00

Frame format:

0: Motorola SPI frame format

2: National MicroWire frame format

24:23

SPIM

0x0

SPI Master transmission mode (in Motorola SPI master mode

only):

00b: Full duplex mode.

01b: Transmit mode.

10b: Receive mode.

11b: Combined mode.

RESERVED

0x0

RESERVED

CS1

0x1

Chip Selection for slave one

0: the slave 1 is selected.

1: the slave 1 is not selected.

31:27

RESERVED

0x3

RESERVED

Table 57: SPI - CR1 register description: address offset SPI_BASE_ADDR+0x04

Bit

Field name

Reset

Description

RESERVED

0x0

RESERVED

SSE

0x0

SPI enable.

0: SPI disable.

1: SPI enable.

0x0

Master or slave mode select.

0: Master mode.

1: Slave mode.

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