C8051F124TB Silicon Laboratories Inc, C8051F124TB Datasheet - Page 265
![MCU, MPU & DSP Development Tools With C8051F124 MCU](/photos/15/91/159197/tqfp-100_sml.jpg)
C8051F124TB
Manufacturer Part Number
C8051F124TB
Description
MCU, MPU & DSP Development Tools With C8051F124 MCU
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F120DK.pdf
(350 pages)
Specifications of C8051F124TB
Processor To Be Evaluated
C8051F12x and C8051F13x
Interface Type
USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
Setting the SMBus0 Free Timer Enable bit (FTE, SMB0CN.1) to logic 1 enables the timer in SMB0CR.
When SCL goes high, the timer in SMB0CR counts up. A timer overflow indicates a free bus timeout: if
SMBus0 is waiting to generate a START, it will do so after this timeout. The bus free period should be less
than 50 µs (see SFR Definition 19.2, SMBus0 Clock Rate Register).
When the TOE bit in SMB0CN is set to logic 1, Timer 3 is used to detect SCL low timeouts. If Timer 3 is
enabled (see
Section “23.2. Timer 2, Timer 3, and Timer 4” on page 317
), Timer 3 is forced to reload
when SCL is high, and forced to count when SCL is low. With Timer 3 enabled and configured to overflow
after 25 ms (and TOE set), a Timer 3 overflow indicates a SCL low timeout; the Timer 3 interrupt service
routine can then be used to reset SMBus0 communication in the event of an SCL low timeout.
Rev. 1.4
265
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