C8051F930-TB Silicon Laboratories Inc, C8051F930-TB Datasheet - Page 248
![BOARD TARGET/PROTO W/C8051F930](/photos/9/25/92560/c8051f930-tb_sml.jpg)
C8051F930-TB
Manufacturer Part Number
C8051F930-TB
Description
BOARD TARGET/PROTO W/C8051F930
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F930-TB
Contents
Board
Processor To Be Evaluated
C8051F930
Processor Series
C8051F9xx
Data Bus Width
8 bit
Interface Type
I2C, UART, SPI
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
0.9 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F930
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1472
- Current page: 248 of 324
- Download datasheet (3Mb)
C8051F93x-C8051F92x
22.5.2. Read Sequence (Master)
During a read sequence, an SMBus master reads data from a slave device. The master in this transfer will
be a transmitter during the address byte, and a receiver during all data bytes. 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 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.
If hardware ACK generation is disabled, the ACKRQ is set to 1 and an interrupt is generated after each
received byte. Software must write the ACK bit at that time to ACK or NACK the received byte.
With hardware ACK generation enabled, the SMBus hardware will automatically generate the ACK/NACK,
and then post the interrupt. It is important to note that the appropriate ACK or NACK value should be
set up by the software prior to receiving the byte when hardware ACK generation is enabled.
Writing a 1 to the ACK bit generates an ACK; writing a 0 generates a NACK. Software should write a 0 to
the ACK bit for the last data transfer, to transmit a NACK. The interface exits Master Receiver Mode after
the STO bit is set and a STOP is generated. The interface will switch to Master Transmitter Mode if
SMB0DAT is written while an active Master Receiver. Figure 22.6 shows a typical master read sequence.
Two received data bytes are shown, though any number of bytes may be received. The “data byte
transferred” interrupts occur at different places in the sequence, depending on whether hardware ACK
generation is enabled. The interrupt occurs before the ACK with hardware ACK generation disabled, and
after the ACK when hardware ACK generation is enabled.
248
S
Received by SMBus
Interface
Transmitted by
SMBus Interface
SLA
Figure 22.6. Typical Master Read Sequence
Interrupts with Hardware ACK Disabled (EHACK = 0)
Interrupts with Hardware ACK Enabled (EHACK = 1)
R
A
Data Byte
Rev. 1.1
A
S = START
P = STOP
A = ACK
N = NACK
R = READ
SLA = Slave Address
Data Byte
N
P
Related parts for C8051F930-TB
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![500SAAB8M00000ACF](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
SMD/C°/SINGLE-ENDED OUTPUT SILICON OSCILLATOR
Manufacturer:
Silicon Laboratories Inc
![SI3210MFT](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![4010-DAAKF_868](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
N/A N/A/SI4010 AES KEYFOB DEMO WITH LCD RX
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![4010-DASKF_868](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
N/A N/A/SI4010 SIMPLIFIED KEY FOB DEMO WITH LED RX
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![4432-SEB1 C 915](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
N/A/-40 TO 85 OC/EZLINK MODULE; F930/4432 HIGH BAND (REV E/B1)
Manufacturer:
Silicon Laboratories Inc
![4432-SEB1 D 470](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
EZLink Module; F930/4432 Low Band (rev e/B1)
Manufacturer:
Silicon Laboratories Inc
![4460-TCE10D434-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4460 10 DBM RADIO TEST CARD 434 MHZ
Manufacturer:
Silicon Laboratories Inc
![4461-TSQ14D868-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4461 14 DBM RADIO TEST CARD 868 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TCE20C460-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4463 20 DBM RFSWITCH RADIO TEST CARD 460 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TCE20C868-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4463 20 DBM RADIO TEST CARD 868 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TCE27F868-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4463 27 DBM RADIO TEST CARD 868 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TCE30E915S-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4463 SKYWORKS 30 DBM RADIO TEST CARD 915 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TCE30E915R-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
N/A N/A/-40 TO 85 OC/4463 RFMD 30 DBM RADIO TEST CARD 915 MHZ
Manufacturer:
Silicon Laboratories Inc
![4463-TSQ20D169-EK](/images/manufacturer_photos/0/6/609/silicon_laboratories_inc_tmb.jpg)
Part Number:
Description:
I°/4463 20 DBM RADIO TEST CARD 169 MHZ
Manufacturer:
Silicon Laboratories Inc