C8051F930DK Silicon Laboratories Inc, C8051F930DK Datasheet - Page 240

• Manufacturer Part Number: C8051F930DK
• Description: KIT DEV C8051F920,F921,F930,F931
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F930DK

• Contents: Target Board, Power Adapter, USB Debug Adapter, Cables, Batteries, and Software
• Processor To Be Evaluated: C8051F930
• Processor Series: C8051F9xx
• Data Bus Width: 8 bit
• Interface Type: I2C, UART, SPI
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 0.9 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F920, F921, F930, F931
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1473

C8051F93x-C8051F92x
SFR Definition 22.1. SMB0CF: SMBus Clock/Configuration
SFR Page = 0x0; SFR Address = 0xC1
240
Reset
Name
Bit
1
Type
7
6
5
4
3
2
Bit
:
0 SMBCS[1:0] SMBus Clock Source Selection.
EXTHOLD
SMBTOE
SMBFTE
ENSMB
Name
BUSY
ENSMB
INH
R/W
7
0
SMBus Enable.
This bit enables the SMBus interface when set to 1. When enabled, the interface
constantly monitors the SDA and SCL pins.
SMBus Slave Inhibit.
When this bit is set to logic 1, the SMBus does not generate an interrupt when slave
events occur. This effectively removes the SMBus slave from the bus. Master Mode
interrupts are not affected.
SMBus Busy Indicator.
This bit is set to logic 1 by hardware when a transfer is in progress. It is cleared to
logic 0 when a STOP or free-timeout is sensed.
SMBus Setup and Hold Time Extension Enable.
This bit controls the SDA setup and hold times according to Table 22.2.
0: SDA Extended Setup and Hold Times disabled.
1: SDA Extended Setup and Hold Times enabled.
SMBus SCL Timeout Detection Enable.
This bit enables SCL low timeout detection. If set to logic 1, the SMBus forces
Timer 3 to reload while SCL is high and allows Timer 3 to count when SCL goes low.
If Timer 3 is configured to Split Mode, only the High Byte of the timer is held in reload
while SCL is high. Timer 3 should be programmed to generate interrupts at 25 ms,
and the Timer 3 interrupt service routine should reset SMBus communication.
SMBus Free Timeout Detection Enable.
When this bit is set to logic 1, the bus will be considered free if SCL and SDA remain
high for more than 10 SMBus clock source periods.
These two bits select the SMBus clock source, which is used to generate the SMBus
bit rate. The selected device should be configured according to Equation 22.1.
00: Timer 0 Overflow
01: Timer 1 Overflow
10:Timer 2 High Byte Overflow
11: Timer 2 Low Byte Overflow
R/W
INH
0
6
BUSY
R
5
0
EXTHOLD SMBTOE
R/W
Rev. 1.1
4
0
Function
R/W
3
0
SMBFTE
R/W
2
0
1
0
SMBCS[1:0]
R/W
0
0