RM0440 Rev 4 1859/2126
RM0440 Inter-integrated circuit (I2C) interface
1928
41 Inter-integrated circuit (I2C) interface
41.1 Introduction
The I
2
C (inter-integrated circuit) bus interface handles communications between the
microcontroller and the serial I
2
C bus. It provides multimaster capability, and controls all I
2
C
bus-specific sequencing, protocol, arbitration and timing. It supports Standard-mode (Sm),
Fast-mode (Fm) and Fast-mode Plus (Fm+).
It is also SMBus (system management bus) and PMBus (power management bus)
compatible.
DMA can be used to reduce CPU overload.
41.2 I2C main features
• I
2
C bus specification rev03 compatibility:
– Slave and master modes
– Multimaster capability
– Standard-mode (up to 100 kHz)
– Fast-mode (up to 400 kHz)
– Fast-mode Plus (up to 1 MHz)
– 7-bit and 10-bit addressing mode
– Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask)
– All 7-bit addresses acknowledge mode
– General call
– Programmable setup and hold times
– Easy to use event management
– Optional clock stretching
– Software reset
• 1-byte buffer with DMA capability
• Programmable analog and digital noise filters
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