STMicroelectronics STM32F05 series User Manual

Serial peripheral interface / inter-IC sound (SPI/I2S) RM0091
670/742 Doc ID 018940 Rev 1
26.7 SPI and I
2
S registers
The peripheral registers can be accessed by half-words (16-bit) or words (32-bit). SPI_DR in
addition by can be accessed by 8-bit access.
26.7.1 SPI control register 1 (SPIx_CR1)
Address offset: 0x00
Reset value: 0x0000
1514131211109876543210
BIDI
MODE
BIDI
OE
CRC
EN
CRC
NEXT
CRCL
RX
ONLY
SSM SSI
LSB
FIRST
SPE BR [2:0] MSTR CPOL CPHA
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bit 15 BIDIMODE: Bidirectional data mode enable
0: 2-line unidirectional data mode selected
1: 1-line bidirectional data mode selected
Note: This bit is not used in I
2
S mode
Bit 14 BIDIOE: Output enable in bidirectional mode
This bit combined with the BIDImode bit selects the direction of transfer in bidirectional mode
0: Output disabled (receive-only mode)
1: Output enabled (transmit-only mode)
Note: 1. In master mode, the MOSI pin is used and in slave mode, the MISO pin is used.
2. This bit is not used in I
2
S mode
Bit 13 CRCEN: Hardware CRC calculation enable
0: CRC calculation disabled
1: CRC calculation Enabled
Note: 1. This bit should be written only when SPI is disabled (SPE = ‘0’) for correct operation
2. This bit is not used in I
2
S mode
Bit 12 CRCNEXT: Transmit CRC next
0: Next transmit value is from Tx buffer
1: Next transmit value is from Tx CRC register
Note: 1. This bit has to be written as soon as the last data is written in the SPIx_DR register.
2. This bit is not used in I
2
S mode
Bit 11 CRCL: CRC length
This bit is set and cleared by software to select the CRC length.
0: 8-bit CRC length
1: 16-bit CRC length
Note: 1. This bit should be written only when SPI is disabled (SPE = ‘0’) for correct operation
2. This bit is not used in I
2
S mode
Bit 10 RXONLY: Receive only
This bit combined with the BIDImode bit selects the direction of transfer in 2-line
unidirectional mode. This bit is also useful in a multislave system in which this particular
slave is not accessed, the output from the accessed slave is not corrupted.
0: Full duplex (Transmit and receive)
1: Output disabled (Receive-only mode)
Note: This bit is not used in I
2
S mode

STMicroelectronics STM32F05 series Specifications

General

Brand	STMicroelectronics
Model	STM32F05 series
Category	Microcontrollers
Language	English