C8051F130 Silicon Laboratories Inc, C8051F130 Datasheet - Page 262
C8051F130
Manufacturer Part Number
C8051F130
Description
IC 8051 MCU 128K FLASH 100TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F13xr
Specifications of C8051F130
Core Processor
8051
Core Size
8-Bit
Speed
100MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
64
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
336-1147
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19.3. SMBus Transfer Modes
The SMBus0 interface may be configured to operate as a master and/or a slave. At any particular time, the
interface will be operating in one of the following modes: Master Transmitter, Master Receiver, Slave
Transmitter, or Slave Receiver. See Table 19.1 for transfer mode status decoding using the SMB0STA sta-
tus register. The following mode descriptions illustrate an interrupt-driven SMBus0 application; SMBus0
may alternatively be operated in polled mode.
19.3.1. Master Transmitter Mode
Serial data is transmitted on SDA while the serial clock is output on SCL. SMBus0 generates a START
condition and then transmits the first byte containing the address of the target slave device and the data
direction bit. In this case the data direction bit (R/W) will be logic 0 to indicate a "WRITE" operation. The
SMBus0 interface transmits one or more bytes of serial data, waiting for an acknowledge (ACK) from the
slave after each byte. To indicate the end of the serial transfer, SMBus0 generates a STOP condition.
19.3.2. Master Receiver Mode
Serial data is received on SDA while the serial clock is output on SCL. The SMBus0 interface generates a
START followed by the first data 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 to indicate a "READ" operation. The SMBus0 inter-
face receives serial data from the slave and generates the clock on SCL. After each byte is received,
SMBus0 generates an ACK or NACK depending on the state of the AA bit in register SMB0CN. SMBus0
generates a STOP condition to indicate the end of the serial transfer.
262
Interrupt
S
Interrupt
S
Received by SMBus
Interface
Transmitted by
SMBus Interface
Figure 19.4. Typical Master Transmitter Sequence
Received by SMBus
Interface
Transmitted by
SMBus Interface
Figure 19.5. Typical Master Receiver Sequence
SLA
SLA
W
R
Interrupt
A
Interrupt
A
Data Byte
Data Byte
Rev. 1.4
Interrupt
Interrupt
A
A
S = START
P = STOP
A = ACK
N = NACK
R = READ
SLA = Slave Address
Data Byte
S = START
P = STOP
A = ACK
W = WRITE
SLA = Slave Address
Data Byte
Interrupt
N
Interrupt
A
P
P
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