C8051F38B-GMR データシートの表示（PDF） - Silicon Laboratories

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C8051F38B-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

Table 22.5. SMBus Status Decoding: Hardware ACK Disabled (EHACK = 0) (Continued)

Values Read

Values to

Write

Current SMbus State

Typical Response Options

0010

0

1

X

Lost arbitration while attempt-

ing a repeated START.

Abort failed transfer.

Reschedule failed transfer.

0001

0

1

X

Lost arbitration due to a

detected STOP.

Abort failed transfer.

Reschedule failed transfer.

0000

1

1

X

Lost arbitration while transmit-

ting a data byte as master.

Abort failed transfer.

Reschedule failed transfer.

00X —

1 0 X 1110

00X —

1 0 X 1110

000 —

1 0 0 1110

Table 22.6. SMBus Status Decoding: Hardware ACK Enabled (EHACK = 1)

Values Read

Values to

Write

Current SMbus State

Typical Response Options

1110

0

0

X

A master START was gener-

ated.

Load slave address + R/W into

SMB0DAT.

0 0 X 1100

A master data or address byte Set STA to restart transfer.

0 0 0 was transmitted; NACK

received.

Abort transfer.

1 0 X 1110

01X —

Load next data byte into SMB0- 0 0 X 1100

DAT.

End transfer with STOP.

01X —

1100

0

0

1

A master data or address byte

was transmitted; ACK

End transfer with STOP and start

another transfer.

1

1

X

—

received.

Send repeated START.

1 0 X 1110

Switch to Master Receiver Mode 0 0 1 1000

(clear SI without writing new data

to SMB0DAT). Set ACK for initial

data byte.

Rev. 1.4

229

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