C8051F38B-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F38B-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

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

SFR Definition 22.5. SMB1CN: SMBus Control

Bit

7

6

5

4

3

2

1

0

Name MASTER1 TXMODE1 STA1

STO1 ACKRQ1 ARBLOST1 ACK1

SI1

Type

R

R

R/W

R/W

R

R

R/W

R/W

Reset

0

0

0

0

0

0

0

0

SFR Address = 0xC0; SFR Page = F; Bit-Addressable

Bit Name

Description

Read

Write

7 MASTER1 SMBus1 Master/Slave

0: SMBus1 operating in N/A

Indicator. This read-only bit slave mode.

indicates when the SMBus1 is 1: SMBus1 operating in

operating as a master.

master mode.

6 TXMODE1 SMBus1 Transmit Mode

0: SMBus1 in Receiver N/A

Indicator. This read-only bit Mode.

indicates when the SMBus1 is 1: SMBus1 in Transmitter

operating as a transmitter. Mode.

5

STA1 SMBus1 Start Flag.

0: No Start or repeated

Start detected.

1: Start or repeated Start

detected.

0: No Start generated.

1: When Configured as a

Master, initiates a START

or repeated START.

4

STO1 SMBus1 Stop Flag.

0: No Stop condition

0: No STOP condition is

detected.

transmitted.

1: Stop condition detected 1: When configured as a

(if in Slave Mode) or

Master, causes a STOP

pending (if in Master

condition to be transmit-

Mode).

ted after the next ACK

cycle.

Cleared by Hardware.

3 ACKRQ1 SMBus1 Acknowledge

Request.

0: No ACK requested

N/A

1: ACK requested

2 ARBLOST1 SMBus1 Arbitration Lost

0: No arbitration error.

N/A

Indicator.

1: Arbitration Lost

1

ACK1 SMBus1 Acknowledge.

0: NACK received.

1: ACK received.

0: Send NACK

1: Send ACK

0

SI1

SMBus1 Interrupt Flag.

0: No interrupt pending 0: Clear interrupt, and ini-

This bit is set by hardware 1: Interrupt Pending

tiate next state machine

under the conditions listed in

event.

Table 15.3. SI1 must be

1: Force interrupt.

cleared by software. While SI1

is set, SCL1 is held low and

the SMBus1 is stalled.

216

Rev. 1.4

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