ST STM32F101xx User Manual

RM0008 Serial peripheral interface (SPI)
Doc ID 13902 Rev 12 723/1096
25.5.8 SPI_I
2
S configuration register (SPI_I2SCFGR)
Address offset: 0x1C
Reset value: 0x0000
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
I2SMOD I2SE I2SCFG
PCMSY
NC
Reserved
I2SSTD CKPOL DATLEN CHLEN
rw rw rw rw rw rw rw rw rw rw rw
Bits 15:12 Reserved: Forced to 0 by hardware
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
2
S is disabled
Bit 10 I2SE: I2S Enable
0: I
2
S peripheral is disabled
1: I
2
S peripheral is enabled
Note: Not used in SPI mode
Bit 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
2
S is disabled.
Not used for the 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)
Not used for the SPI mode
Bit 6 Reserved: forced at 0 by hardware
Bit 5:4 I2SSTD: I2S standard selection
00: I
2
S Phillips standard.
01: MSB justified standard (left justified)
10: LSB justified standard (right justified)
11: PCM standard
For more details on I
2
S standards, refer to Section 25.4.2 on page 698
Note: For correct operation, these bits should be configured when the I
2
S is disabled.
Not used in SPI mode
Bit 3 CKPOL: Steady state clock polarity
0: I
2
S clock steady state is low level
1: I
2
S clock steady state is high level
Note: For correct operation, this bit should be configured when the I
2
S is disabled.
Not used in SPI mode

ST STM32F101xx Specifications

General

Brand	ST
Model	STM32F101xx
Category	Microcontrollers
Language	English