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C8051F360 Datasheet(PDF) 202 Page - Silicon Laboratories |
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C8051F360 Datasheet(HTML) 202 Page - Silicon Laboratories |
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202 / 288 page ![]() C8051F360/1/2/3/4/5/6/7/8/9 202 Rev. 1.0 18. SMBus The SMBus I/O interface is a two-wire, bi-directional serial bus. The SMBus is compliant with the System Management Bus Specification, version 1.1, and compatible with the I2C serial bus. Reads and writes to the interface by the system controller are byte oriented with the SMBus interface autonomously controlling the serial transfer of the data. Data can be transferred at up to 1/10th of the system clock as a master or slave (this can be faster than allowed by the SMBus specification, depending on the system clock used). A method of extending the clock-low duration is available to accommodate devices with different speed capabilities on the same bus. The SMBus interface may operate as a master and/or slave, and may function on a bus with multiple mas- ters. The SMBus provides control of SDA (serial data), SCL (serial clock) generation and synchronization, arbitration logic, and START/STOP control and generation. Three SFRs are associated with the SMBus: SMB0CF configures the SMBus; SMB0CN controls the status of the SMBus; and SMB0DAT is the data register, used for both transmitting and receiving SMBus data and slave addresses. Data Path Control SMBUS CONTROL LOGIC C R O S S B A R SCL FILTER N SDA Control SCL Control Arbitration SCL Synchronization IRQ Generation SCL Generation (Master Mode) SDA Control Interrupt Request Port I/O SMB0CN S T A A C K R Q A R B L O S T A C K S I T X M O D E M A S T E R S T O 01 00 10 11 T0 Overflow T1 Overflow TMR2H Overflow TMR2L Overflow SMB0CF E N S M B I N H B U S Y E X T H O L D S M B T O E S M B F T E S M B C S 1 S M B C S 0 0 1 2 3 4 5 6 7 SMB0DAT SDA FILTER N Figure 18.1. SMBus Block Diagram |
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