SLASF77A December 2022 – September 2023 AFE11612-SEP
PRODUCTION DATA
When the bus is idle, both SDA and SCL lines are pulled high by the pull-up devices.
The controller generates a start condition followed by a valid serial byte containing Hs controller code 00001xxx. This transmission is made in F/S mode at no more than 400Kbps. No device is allowed to acknowledge the Hs controller code, but all devices must recognize the Hs controller code and switch the internal setting to support 3.4Mbps operation.
The controller then generates a repeated start condition (a repeated start condition has the same timing as the start condition). After this repeated start condition, the protocol is the same as for F/S mode, except that transmission speeds up to 3.4Mbps are allowed. A stop condition ends Hs mode and switches all internal settings of the target devices to support F/S mode. Instead of using a stop condition, repeated start conditions are used to secure the bus in Hs mode.