Figure 32. I2S Master Timing Diagram (Philips Protocol) - STMicroelectronics STM32F042G4 Manual

Electrical characteristics
1. Data based on characterization results, not tested in production.
2. LSB transmit/receive of the previously transmitted byte. No LSB transmit/receive is sent before the first
byte.
CAN (controller area network) interface
Refer to Section 6.3.14: I/O port characteristics
function characteristics (CAN_TX and CAN_RX).
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Figure 32. I2S master timing diagram (Philips protocol)

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for more details on the input/output alternate
STM32F042xx