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C8051F54X_14 Datasheet, PDF (196/275 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family | |||
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C8051F54x
Bit
MASTER
TXMODE
STA
STO
ACKRQ
ARBLOST
ACK
SI
Table 20.3. Sources for Hardware Changes to SMB0CN
Set by Hardware When:
Cleared by Hardware When:
ï® A START is generated.
ï® A STOP is generated.
ï® Arbitration is lost.
ï® START is generated.
ï® SMB0DAT is written before the start of an
SMBus frame.
ï® A START is detected.
ï® Arbitration is lost.
ï® SMB0DAT is not written before the
start of an SMBus frame.
ï® A START followed by an address byte is
received.
ï® Must be cleared by software.
ï® A STOP is detected while addressed as a
slave.
ï® Arbitration is lost due to a detected STOP.
ï® A pending STOP is generated.
ï® A byte has been received and an ACK
response value is needed.
ï® After each ACK cycle.
ï® A repeated START is detected as a
MASTER when STA is low (unwanted
repeated START).
ï® SCL is sensed low while attempting to
generate a STOP or repeated START
condition.
ï® SDA is sensed low while transmitting a 1
(excluding ACK bits).
ï® Each time SI is cleared.
ï® The incoming ACK value is low ï
(ACKNOWLEDGE).
ï® The incoming ACK value is high
(NOT ACKNOWLEDGE).
ï® A START has been generated.
ï® Lost arbitration.
ï® A byte has been transmitted and an
ACK/NACK received.
ï® A byte has been received.
ï® A START or repeated START followed by a
slave address + R/W has been received.
ï® A STOP has been received.
ï® Must be cleared by software.
196
Rev. 1.1
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