C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 185

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• 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: 21
• 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 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Bit
ARBLOST
TXMODE
MASTER
ACKRQ
ACK
STA
STO
SI
Set by Hardware When:
• A START is generated.
• START is generated.
• SMB0DAT is written before the start of an SMBus
• A START followed by an address byte is received. • Must be cleared by software.
• A STOP is detected while addressed as a slave.
• Arbitration is lost due to a detected STOP.
• A byte has been received and an ACK response
• A repeated START is detected as a MASTER when
• SCL is sensed low while attempting to generate a
• SDA is sensed low while transmitting a ‘1’
• The incoming ACK value is low (ACKNOWL-
• A START has been generated.
• Lost arbitration.
• A byte has been transmitted and an ACK/NACK
• A byte has been received.
• A START or repeated START followed by a slave
• A STOP has been received.
frame.
value is needed.
STA is low (unwanted repeated START).
STOP or repeated START condition.
(excluding ACK bits).
EDGE).
received.
address + R/W has been received.
Table 16.3. Sources for Hardware Changes to SMB0CN
Rev. 1.1
Cleared by Hardware When:
• A STOP is generated.
• Arbitration is lost.
• A START is detected.
• Arbitration is lost.
• SMB0DAT is not written before the start
• A pending STOP is generated.
• After each ACK cycle.
• Each time SI is cleared.
• The incoming ACK value is high (NOT
• Must be cleared by software.
of an SMBus frame.
ACKNOWLEDGE).
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