C8051F131R Silicon Labs, C8051F131R Datasheet - Page 268

• Manufacturer Part Number: C8051F131R
• Description: 8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
• Manufacturer: Silicon Labs

Specifications of C8051F131R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 100 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 9
• Data Rom Size: 64 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
19.4.3. Data Register
The SMBus0 Data register SMB0DAT holds a byte of serial data to be transmitted or one that has just
been received. Software can read or write to this register while the SI flag is set to logic 1; software should
not attempt to access the SMB0DAT register when the SMBus is enabled and the SI flag reads logic 0
since the hardware may be in the process of shifting a byte of data in or out of the register.
Data in SMB0DAT is always shifted out MSB first. After a byte has been received, the first bit of received
data is located at the MSB of SMB0DAT. While data is being shifted out, data on the bus is simultaneously
being shifted in. Therefore, SMB0DAT always contains the last data byte present on the bus. In the event
of lost arbitration, the transition from master transmitter to slave receiver is made with the correct data in
SMB0DAT.
19.4.4. Address Register
The SMB0ADR Address register holds the slave address for the SMBus0 interface. In slave mode, the
seven most-significant bits hold the 7-bit slave address. The least significant bit (Bit0) is used to enable the
recognition of the general call address (0x00). If Bit0 is set to logic 1, the general call address will be recog-
nized. Otherwise, the general call address is ignored. The contents of this register are ignored when
SMBus0 is operating in master mode.
268
Bits7–0: SMB0DAT: SMBus0 Data.
R/W
Bit7
The SMB0DAT register contains a byte of data to be transmitted on the SMBus0 serial inter-
face or a byte that has just been received on the SMBus0 serial interface. The CPU can
read from or write to this register whenever the SI serial interrupt flag (SMB0CN.3) is set to
logic 1. When the SI flag is not set, the system may be in the process of shifting data and the
CPU should not attempt to access this register.
R/W
Bit6
SFR Definition 19.3. SMB0DAT: SMBus0 Data
R/W
Bit5
R/W
Bit4
Rev. 1.4
R/W
Bit3
R/W
Bit2
R/W
Bit1
SFR Address:
SFR Page:
R/W
Bit0
0xC2
0
00000000
Reset Value