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C8051F321-GMR Datasheet, PDF (178/250 Pages) Silicon Laboratories – Full Speed USB, 16 k ISP FLASH MCU Family | |||
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C8051F320/1
Bit
MASTER
TXMODE
STA
STO
ACKRQ
ARBLOST
ACK
SI
Table 16.3. Sources for Hardware Changes to SMB0CN
Set by Hardware When:
Cleared by Hardware When:
⢠A START is generated.
⢠A STOP is generated.
⢠Arbitration is lost.
⢠START is generated.
⢠SMB0DAT is written before the start of an
SMBus frame.
⢠A START is detected.
⢠Arbitration is lost.
⢠SMB0DAT is not written before the
start of an SMBus frame.
⢠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 pending STOP is generated.
⢠A byte has been received and an ACK
response value is needed.
⢠After each ACK cycle.
⢠A repeated START is detected as a MASTER ⢠Each time SI is cleared.
when STA is low (unwanted repeated START).
⢠SCL is sensed low while attempting to gener-
ate a STOP or repeated START condition.
⢠SDA is sensed low while transmitting a â1â
(excluding ACK bits).
⢠The incoming ACK value is low (ACKNOWL- ⢠The incoming ACK value is high (NOT
EDGE).
ACKNOWLEDGE).
⢠A START has been generated.
⢠Lost arbitration.
⢠A byte has been transmitted and an
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.
⢠Must be cleared by software.
178
Rev. 1.4
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