Inter-integrated circuit (I2C) interface RM0440
1894/2126 RM0440 Rev 4
Bus protocols
There are eleven possible command protocols for any given device. A device may use any
or all of the eleven protocols to communicate. The protocols are Quick Command, Send
Byte, Receive Byte, Write Byte, Write Word, Read Byte, Read Word, Process Call, Block
Read, Block Write and Block Write-Block Read Process Call. These protocols should be
implemented by the user software.
For more details of these protocols, refer to SMBus specification (http://smbus.org).
Address resolution protocol (ARP)
SMBus slave address conflicts can be resolved by dynamically assigning a new unique
address to each slave device. In order to provide a mechanism to isolate each device for the
purpose of address assignment each device must implement a unique device identifier
(UDID). This 128-bit number is implemented by software.
This peripheral supports the Address Resolution Protocol (ARP). The SMBus Device
Default Address (0b1100 001) is enabled by setting SMBDEN bit in I2C_CR1 register. The
ARP commands should be implemented by the user software.
Arbitration is also performed in slave mode for ARP support.
For more details of the SMBus Address Resolution Protocol, refer to SMBus specification
(http://smbus.org).
Received Command and Data acknowledge control
A SMBus receiver must be able to NACK each received command or data. In order to allow
the ACK control in slave mode, the Slave Byte Control mode must be enabled by setting
SBC bit in I2C_CR1 register. Refer to Slave Byte Control mode on page 1873 for more
details.
Host Notify protocol
This peripheral supports the Host Notify protocol by setting the SMBHEN bit in the I2C_CR1
register. In this case the host acknowledges the SMBus Host Address (0b0001 000).
When this protocol is used, the device acts as a master and the host as a slave.
SMBus alert
The SMBus ALERT optional signal is supported. A slave-only device can signal the host
through the SMBALERT# pin that it wants to talk. The host processes the interrupt and
simultaneously accesses all SMBALERT# devices through the Alert Response Address
(0b0001 100). Only the device(s) which pulled SMBALERT# low acknowledges the Alert
Response Address.
When configured as a slave device(SMBHEN=0), the SMBA pin is pulled low by setting the
ALERTEN bit in the I2C_CR1 register. The Alert Response Address is enabled at the same
time.
When configured as a host (SMBHEN=1), the ALERT flag is set in the I2C_ISR register
when a falling edge is detected on the SMBA pin and ALERTEN=1. An interrupt is
generated if the ERRIE bit is set in the I2C_CR1 register. When ALERTEN=0, the ALERT
line is considered high even if the external SMBA pin is low.
If the SMBus ALERT pin is not needed, the SMBA pin can be used as a standard GPIO if
ALERTEN=0.
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