C8051F410-TB Silicon Laboratories Inc, C8051F410-TB Datasheet - Page 183
C8051F410-TB
Manufacturer Part Number
C8051F410-TB
Description
BOARD PROTOTYPING W/C8051F410
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F410-TB
Contents
Board
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F410
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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20.2.3. Automatic Gain Control (Crystal Mode Only)
Automatic Gain Control is enabled by setting AGCEN (RTC0XCN.7) to a logic 1. When enabled, the
smaRTClock oscillator trims the oscillation amplitude to save power. This mode is useful for preserving
battery life in systems where oscillator performance is not critical and external conditions are stable.
Note: Setting the AGCEN to a logic 1 in self-oscillator mode can lead to drastic changes in the smaRT-
Clock oscillator frequency.
20.2.4. smaRTClock Bias Doubling
The smaRTClock Bias Doubling is enabled by setting BIASX2 (RTC0XCN.5) to 1b. When enabled, the
bias current to smaRTClock is doubled allowing for more robust oscillator performance. When the smaRT-
Clock oscillator is in Self-Oscillate mode, the oscillation frequency is increased from 20 to 40 kHz. When
operating in Crystal Mode, the oscillator is less likely to be affected by external conditions when
BIASX2 = ‘1’. Enabling Bias Doubling increases the power consumption of smaRTClock; therefore, it is not
recommended for use in power-critical systems.
20.2.5. smaRTClock Missing Clock Detector
The smaRTClock Missing Clock Detector is a one-shot circuit enabled by setting MCLKEN (RTC0CN.6) to
a logic 1. When the smaRTClock Missing Clock Detector is enabled, OSCFAIL (RTC0CN.5) is set by hard-
ware if RTCCLK remains high or low for more than 50 µs. A smaRTClock Missing Clock detector timeout
triggers three events:
Note: The smaRTClock Missing Clock Detector should be disabled when making changes to the oscillator
settings in RTC0XCN.
1. Awakening the internal oscillator from Suspend Mode.
2. smaRTClock Interrupt (If the smaRTClock Interrupt is enabled).
3. MCU reset (If smaRTClock is enabled as a reset source).
Rev. 1.1
C8051F410/1/2/3
183
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