C8051T610/1/2/3/4/5/6/7
Table 22.3. Sources for Hardware Changes to SMB0CN
Bit
Set by Hardware When:
Cleared by Hardware When:
MASTER
TXMODE
?
?
?
A START is generated.
START is generated.
SMB0DAT is written before the start of an
SMBus frame.
?
?
?
?
?
A STOP is generated.
Arbitration is lost.
A START is detected.
Arbitration is lost.
SMB0DAT is not written before the
start of an SMBus frame.
STA
?
?
A START followed by an address byte is
received.
A STOP is detected while addressed as a
?
?
Must be cleared by software.
A pending STOP is generated.
STO
?
slave.
Arbitration is lost due to a detected STOP.
ACKRQ
?
A byte has been received and an ACK
response value is needed (only when
?
After each ACK cycle.
hardware ACK is not enabled).
?
A repeated START is detected as a
?
Each time SI is cleared.
MASTER when STA is low (unwanted
repeated START).
ARBLOST
?
?
SCL is sensed low while attempting to
generate a STOP or repeated START
condition.
SDA is sensed low while transmitting a 1
(excluding ACK bits).
ACK
?
?
The incoming ACK value is low ?
(ACKNOWLEDGE).
A START has been generated.
?
?
The incoming ACK value is high
(NOT ACKNOWLEDGE).
Must be cleared by software.
?
?
Lost arbitration.
A byte has been transmitted and an
SI
?
?
?
ACK/NACK received.
A byte has been received.
A START or repeated START followed by a
slave address + R/W has been received.
A STOP has been received.
Rev 1.1
141
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