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EFM8BB31F32G-A-QFN24 Datasheet(PDF) 7 Page - Silicon Laboratories

Part # EFM8BB31F32G-A-QFN24
Description  The EFM8BB3 device family are fully integrated, mixed-signal system-on-a-chip MCUs. Highlighted features are listed below
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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3.4 Clocking
The CPU core and peripheral subsystem may be clocked by both internal and external oscillator resources. By default, the system
clock comes up running from the 24.5 MHz oscillator divided by 8.
The clock control system offers the following features:
• Provides clock to core and peripherals.
• 24.5 MHz internal oscillator (HFOSC0), accurate to ±2% over supply and temperature corners.
• 49 MHz internal oscillator (HFOSC1), accurate to ±2% over supply and temperature corners.
• 80 kHz low-frequency oscillator (LFOSC0).
• External Crystal / RC / C Oscillator.
• External CMOS clock input (EXTCLK).
• Clock divider with eight settings for flexible clock scaling:
• Divide the selected clock source by 1, 2, 4, 8, 16, 32, 64, or 128.
• HFOSC0 and HFOSC1 include 1.5x pre-scalers for further flexibility.
3.5 Counters/Timers and PWM
Programmable Counter Array (PCA0)
The programmable counter array (PCA) provides multiple channels of enhanced timer and PWM functionality while requiring less CPU
intervention than standard counter/timers. The PCA consists of a dedicated 16-bit counter/timer and one 16-bit capture/compare mod-
ule for each channel. The counter/timer is driven by a programmable timebase that has flexible external and internal clocking options.
Each capture/compare module may be configured to operate independently in one of five modes: Edge-Triggered Capture, Software
Timer, High-Speed Output, Frequency Output, or Pulse-Width Modulated (PWM) Output. Each capture/compare module has its own
associated I/O line (CEXn) which is routed through the crossbar to port I/O when enabled.
• 16-bit time base
• Programmable clock divisor and clock source selection
• Up to six independently-configurable channels
• 8, 9, 10, 11 and 16-bit PWM modes (center or edge-aligned operation)
• Output polarity control
• Frequency output mode
• Capture on rising, falling or any edge
• Compare function for arbitrary waveform generation
• Software timer (internal compare) mode
• Can accept hardware “kill” signal from comparator 0 or comparator 1
EFM8BB3 Data Sheet
System Overview
silabs.com | Smart. Connected. Energy-friendly.
Preliminary Rev. 0.2 | 6


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