C8051F301-GSR Silicon Labs, C8051F301-GSR Datasheet - Page 124
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C8051F301-GSR
Manufacturer Part Number
C8051F301-GSR
Description
8-bit Microcontrollers - MCU 8KB 2%osc MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051F301-GSR.pdf
(178 pages)
Specifications of C8051F301-GSR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
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C8051F300/1/2/3/4/5
13.5.2. Master Receiver Mode
Serial data is received 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 direc-
tion bit. In this case the data direction bit (R/W) will be logic 1 (READ). Serial data is then received from the
slave on SDA while the SMBus outputs the serial clock. The slave transmits one or more bytes of serial
data. After each byte is received, ACKRQ is set to ‘1’ and an interrupt is generated. Software must write
the ACK bit (SMB0CN.1) to define the outgoing acknowledge value (Note: writing a ‘1’ to the ACK bit gen-
erates an ACK; writing a ‘0’ generates a NACK). Software should write a ‘0’ to the ACK bit after the last
byte is received, to transmit a NACK. The interface exits Master Receiver Mode after the STO bit is set and
a STOP is generated. Note that the interface will switch to Master Transmitter Mode if SMB0DAT is written
while an active Master Receiver. Figure 13.6 shows a typical Master Receiver sequence. Two received
data bytes are shown, though any number of bytes may be received. Notice that the ‘data byte transferred’
interrupts occur before the ACK cycle in this mode.
124
Interrupt
S
Figure 13.6. Typical Master Receiver Sequence
Received by SMBus
Interface
Transmitted by
SMBus Interface
SLA
R
Interrupt
A
Data Byte
Rev. 2.9
Interrupt
A
S = START
P = STOP
A = ACK
N = NACK
R = READ
SLA = Slave Address
Data Byte
Interrupt
N
P
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