Spi_I S Configuration Register (Spi_I2Scfgr) - ST STM32F101 series Reference Manual

Serial peripheral interface (SPI)
Bits 15:0 TXCRC[15:0]: Tx CRC register
Note: A read to this register when the BSY flag is set could return an incorrect value.
2
25.5.8 SPI_I S configuration register (SPI_I2SCFGR)
Address offset: 0x1C
Reset value: 0x0000
15 14 13 12
Reserved
Bits 15:12 Reserved, must be kept at reset value.
Bit 11 I2SMOD: I2S mode selection
0: SPI mode is selected
1: I2S mode is selected
Note: This bit should be configured when the SPI or I
Bit 10 I2SE: I2S Enable
2
0: I S peripheral is disabled
2
1: I S peripheral is enabled
Note: This bit is not used in SPI mode.
Bits 9:8 I2SCFG: I2S configuration mode
00: Slave - transmit
01: Slave - receive
10: Master - transmit
11: Master - receive
Note: This bit should be configured when the I
It is not used in SPI mode.
Bit 7 PCMSYNC: PCM frame synchronization
0: Short frame synchronization
1: Long frame synchronization
Note: This bit has a meaning only if I2SSTD = 11 (PCM standard is used)
It is not used in SPI mode.
Bit 6 Reserved: forced at 0 by hardware
739/1128
When CRC calculation is enabled, the TxCRC[7:0] bits contain the computed CRC value of
the subsequently transmitted bytes. This register is reset when the CRCEN bit of SPI_CR1
is written to 1. The CRC is calculated serially using the polynomial programmed in the
SPI_CRCPR register.
Only the 8 LSB bits are considered when the data frame format is set to be 8-bit data (DFF
bit of SPI_CR1 is cleared). CRC calculation is done based on any CRC8 standard.
The entire 16-bits of this register are considered when a 16-bit data frame format is selected
(DFF bit of the SPI_CR1 register is set). CRC calculation is done based on any CRC16
standard.
These bits are not used for I
11 10 9
I2SMOD I2SE I2SCFG
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2
S mode.
8 7 6
PCMSY
NC
Res.
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2
S is disabled
2
S is disabled.
DocID13902 Rev 15
5 4 3 2
I2SSTD CKPOL DATLEN
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RM0008
1 0
CHLEN
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