C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 191

• Manufacturer Part Number: C8051F320
• Description: IC 8051 MCU 16K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F320

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 25
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 17x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

16.6. SMBus Status Decoding
The current SMBus status can be easily decoded using the SMB0CN register. In the table below, STATUS VECTOR
refers to the four upper bits of SMB0CN: MASTER, TXMODE, STA, and STO. Note that the shown response
options are only the typical responses; application-specific procedures are allowed as long as they conform to the
SMBus specification. Highlighted responses are allowed but do not conform to the SMBus specification.
1000
1110
1100
VALUES READ
0
0
0
1
0
0
0
0
X
X
0
1
CURRENT SMBUS STATE
A master START was generated.
A master data or address byte was
transmitted; NACK received.
A master data or address byte was
transmitted; ACK received.
A master data byte was received;
ACK requested.
Table 16.4. SMBus Status Decoding
Rev. 1.1
TYPICAL RESPONSE
OPTIONS
Load slave address + R/W into
SMB0DAT.
Set STA to restart transfer.
Abort transfer.
Load next data byte into
SMB0DAT.
End transfer with STOP.
End transfer with STOP and
start another transfer.
Send repeated START.
Switch to Master Receiver
Mode (clear SI without writing
new data to SMB0DAT).
Acknowledge received byte;
Read SMB0DAT.
Send NACK to indicate last
byte, and send STOP.
Send NACK to indicate last
byte, and send STOP followed
by START.
Send ACK followed by
repeated START.
Send NACK to indicate last
byte, and send repeated START.
Send ACK and switch to Master
Transmitter Mode (write to
SMB0DAT before clearing SI).
Send NACK and switch to Mas-
ter Transmitter Mode (write to
SMB0DAT before clearing SI).
C8051F320/1
WRITTEN
0
1
0
0
0
1
1
0
0
0
1
1
1
0
0
VALUES
0
0
1
0
1
1
0
0
0
1
1
0
0
0
0
191
X
X
X
X
X
X
X
X
1
0
0
1
0
1
0