| I2C_FLAG | 説明 |
| I2C_FLAG_SMBALERT | SMBus Alert flag |
| I2C_FLAG_TIMEOUT | Timeout or Tlow error flag |
| I2C_FLAG_PECERR | PEC error in reception flag |
| I2C_FLAG_OVR | Overrun/Underrun flag (Slave mode) |
| I2C_FLAG_AF | Acknowledge failure flag |
| I2C_FLAG_ARLO | Arbitration lost flag (Master mode) |
| I2C_FLAG_BERR | Bus error flag |
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