C8051F300DK Silicon Laboratories Inc, C8051F300DK Datasheet - Page 123
C8051F300DK
Manufacturer Part Number
C8051F300DK
Description
DEV KIT F300/301/302/303/304/305
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F300DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F30x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F300
Silicon Family Name
C8051F30x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051 F300/001/002
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1246
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13.5. SMBus Transfer Modes
The SMBus interface may be configured to operate as master and/or slave. At any particular time, it will be
operating in one of the following four modes: Master Transmitter, Master Receiver, Slave Transmitter, or
Slave Receiver. The SMBus interface enters Master Mode any time a START is generated, and remains in
Master Mode until it loses arbitration or generates a STOP. An SMBus interrupt is generated at the end of
all SMBus byte frames; however, note that the interrupt is generated before the ACK cycle when operating
as a receiver, and after the ACK cycle when operating as a transmitter.
13.5.1. Master Transmitter Mode
Serial data is transmitted on SDA while the serial clock is output on SCL. The SMBus interface generates
the START condition and transmits the first byte containing the address of the target slave and the data
direction bit. In this case the data direction bit (R/W) will be logic 0 (WRITE). The master then transmits
one or more bytes of serial data. After each byte is transmitted, an acknowledge bit is generated by the
slave. The transfer is ended when the STO bit is set and a STOP is generated. Note that the interface will
switch to Master Receiver Mode if SMB0DAT is not written following a Master Transmitter interrupt.
Figure 13.5 shows a typical Master Transmitter sequence. Two transmit data bytes are shown, though any
number of bytes may be transmitted. Notice that the ‘data byte transferred’ interrupts occur after the ACK
cycle in this mode.
Figure 13.5. Typical Master Transmitter Sequence
Interrupt
S
Received by SMBus
Interface
Transmitted by
SMBus Interface
SLA
W
Interrupt
A
Data Byte
Rev. 2.9
Interrupt
A
C8051F300/1/2/3/4/5
S = START
P = STOP
A = ACK
W = WRITE
SLA = Slave Address
Data Byte
Interrupt
A
P
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