ST STM32L0x3 User Manual

Inter-integrated circuit (I2C) interface RM0367
702/1043 RM0367 Rev 7
I2C timings
The timings must be configured in order to guarantee a correct data hold and setup time,
used in master and slave modes. This is done by programming the PRESC[3:0],
SCLDEL[3:0] and SDADEL[3:0] bits in the I2C_TIMINGR register.
The STM32CubeMX tool calculates and provides the I2C_TIMINGR content in the I2C
configuration window
Figure 214. Setup and hold timings
MSv40108V1
t
SYNC1
SCL falling edge internal
detection
SDADEL: SCL stretched low by the I2C
SDA output delay
SCL
SDA
DATA HOLD TIME
t
HD;DAT
SCLDEL
SCL stretched low by the I2C
SCL
SDA
DATA SETUP TIME
t
SU;STA
Data hold time: in case of transmission, the data is sent on SDA output after
the SDADEL delay, if it is already available in I2C_TXDR.
Data setup time: in case of transmission, the SCLDEL counter starts
when the data is sent on SDA output.
MS49608V1
t
SYNC1
SCL falling edge internal
detection
SDADEL: SCL stretched low by the I2C
SDA output delay
SCL
SDA
DATA HOLD TIME
t
HD;DAT
SCLDEL
SCL stretched low by the I2C
SCL
SDA
DATA SETUP TIME
t
SU;DAT
Data hold time: in case of transmission, the data is sent on SDA output after
the SDADEL delay, if it is already available in I2C_TXDR.
Data setup time: in case of transmission, the SCLDEL counter starts
when the data is sent on SDA output.

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English