C8051F120-TB Silicon Laboratories Inc, C8051F120-TB Datasheet - Page 267
C8051F120-TB
Manufacturer Part Number
C8051F120-TB
Description
BOARD PROTOTYPING W/C8051F120
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F120-TB
Contents
Board
Processor To Be Evaluated
C8051F12x and C8051F13x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F120
Silicon Family Name
C8051F12x
Kit Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F120
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F120-TB
Manufacturer:
Silicon Labs
Quantity:
135
- Current page: 267 of 350
- Download datasheet (2Mb)
19.4.2. Clock Rate Register
Bits7–0: SMB0CR.[7:0]: SMBus0 Clock Rate Preset
R/W
Bit7
The SMB0CR Clock Rate register controls the frequency of the serial clock SCL in master
mode. The 8-bit word stored in the SMB0CR Register preloads a dedicated 8-bit timer. The
timer counts up, and when it rolls over to 0x00, the SCL logic state toggles.
The SMB0CR setting should be bounded by the following equation , where SMB0CR is the
unsigned 8-bit value in register SMB0CR, and SYSCLK is the system clock frequency in
MHz:
The resulting SCL signal high and low times are given by the following equations, where
SYSCLK is the system clock frequency in Hz:
Using the same value of SMB0CR from above, the Bus Free Timeout period is given in the
following equation:
R/W
Bit6
SFR Definition 19.2. SMB0CR: SMBus0 Clock Rate
SMB0CR
T
HIGH
R/W
Bit5
T
LOW
T
BFT
4
=
288 0.85
10
R/W
Bit4
4
258 SMB0CR
–
–
256 SMB0CR
4
------------------------------------------------------------- -
Rev. 1.4
–
256 SMB0CR
R/W
Bit3
SYSCLK
--------------------- -
SYSCLK
–
C8051F120/1/2/3/4/5/6/7
4
SYSCLK
R/W
Bit2
1.125
SYSCLK
+
C8051F130/1/2/3
+
1
625ns
R/W
Bit1
SFR Address:
SFR Page:
R/W
Bit0
0xCF
0
00000000
Reset Value
267
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