32.6.4.2 Interrupts

The I²C client has the following interrupt sources. These are asynchronous interrupts. They can wake-up the device from any Sleep mode:

• Error (ERROR)
• Data Ready (DRDY)
• Address Match (AMATCH)
• Stop Received (PREC)

The I²C host has the following interrupt sources. These are asynchronous interrupts. They can wake-up the device from any Sleep mode:

• Error (ERROR)
• Client on Bus (SB)
• Host on Bus (MB)

Each interrupt source has its own Interrupt flag. The Interrupt flag in the Interrupt Flag Status and Clear register (INTFLAG) will be set when the Interrupt condition is met. Each interrupt can be individually enabled by writing ‘1’ to the corresponding bit in the Interrupt Enable Set register (INTENSET), and disabled by writing ‘1’ to the corresponding bit in the Interrupt Enable Clear register (INTENCLR).

The status of enabled interrupts can be read from either INTENSET or INTENCLR. An interrupt request is generated when the Interrupt flag is set and the corresponding interrupt is enabled. The interrupt request remains active until the Interrupt flag is cleared, the interrupt is disabled or the I²C is reset. For details on how to clear Interrupt flags, see INTFLAG register from Related Links.

The value of INTFLAG indicates which interrupt is executed. Note that interrupts must be globally enabled for interrupt requests. See Nested Vector Interrupt Controller (NVIC) from Related Links.