I2C Timing Register (I2C_Timingr) - ST STM32WL5 Series Reference Manual

Inter-integrated circuit (I2C) interface
34.7.5

I2C timing register (I2C_TIMINGR)

Address offset: 0x10
Reset value: 0x0000 0000
Access: No wait states
31 30 29 28
PRESC[3:0]
rw rw rw rw
15 14 13 12
SCLH[7:0]
rw rw rw rw
Bits 31:28 PRESC[3:0]: Timing prescaler
Bits 27:24 Reserved, must be kept at reset value.
Bits 23:20 SCLDEL[3:0]: Data setup time
Note: t
Bits 19:16 SDADEL[3:0]: Data hold time
Note: SDADEL is used to generate t
Bits 15:8 SCLH[7:0]: SCL high period (master mode)
Note: SCLH is also used to generate t
Bits 7:0 SCLL[7:0]: SCL low period (master mode)
Note: SCLL is also used to generate t
Note: This register must be configured when the I2C is disabled (PE = 0).
Note: The STM32CubeMX tool calculates and provides the I2C_TIMINGR content in the I2C
Configuration window.
1118/1461
27 26 25
Res. Res. Res.
11 10 9
rw rw rw
This field is used to prescale I2CCLK in order to generate the clock period t
data setup and hold counters (refer to
level counters (refer to I2C master initialization on page
t = (PRESC+1) x t
PRESC
This field is used to generate a delay t
master mode and in slave mode with NOSTRETCH = 0, the SCL line is stretched low during
t .
SCLDEL
t = (SCLDEL+1) x t
SCLDEL
is used to generate t
SCLDEL
This field is used to generate the delay t
master mode and in slave mode with NOSTRETCH = 0, the SCL line is stretched low during
t .
SDADEL
t = SDADEL x t
SDADEL PRESC
This field is used to generate the SCL high period in master mode.
t = (SCLH+1) x t
SCLH PRESC
This field is used to generate the SCL low period in master mode.
t = (SCLL+1) x t
SCLL PRESC
24 23 22
Res. SCLDEL[3:0]
rw rw
8 7 6
rw rw rw
I2C timings on page
I2CCLK
between SDA edge and SCL rising edge. In
SCLDEL
PRESC
timing.
SU:DAT
between SCL falling edge and SDA edge. In
SDADEL
timing.
HD:DAT
and t
SU:STO
and t
BUF SU:STA
RM0453 Rev 1
21 20 19 18
SDADEL[3:0]
rw rw rw rw
5 4 3 2
SCLL[7:0]
rw rw rw rw
1064) and for SCL high and low
1079).
timing.
HD:STA
timings.
RM0453
17 16
rw rw
1 0
rw rw
used for
PRESC