C8051F960-B-GM Datasheet, PDF (6/492 Pages) Silicon Laboratories – Ultra Low Power 128K, LCD MCU Family

C8051F96x
20.5. Selecting the Optimum Switch Size............................................................... 271
20.6. DC-DC Converter Clocking Options .......................................................... 271
20.7. Bypass Mode................................................................................................. 272
20.8. DC-DC Converter Register Descriptions ....................................................... 272
20.9. DC-DC Converter Specifications ................................................................... 276
21. Voltage Regulator (VREG0)................................................................................. 277
21.1. Voltage Regulator Electrical Specifications ................................................... 277
22. Reset Sources ...................................................................................................... 278
22.1. Power-On Reset ............................................................................................ 279
22.2. Power-Fail Reset ........................................................................................... 280
22.3. External Reset ............................................................................................... 283
22.4. Missing Clock Detector Reset ....................................................................... 283
22.5. Comparator0 Reset ....................................................................................... 283
22.6. PCA Watchdog Timer Reset ......................................................................... 283
22.7. Flash Error Reset .......................................................................................... 284
22.8. SmaRTClock (Real Time Clock) Reset ......................................................... 284
22.9. Software Reset .............................................................................................. 284
23. Clocking Sources................................................................................................. 286
23.1. Programmable Precision Internal Oscillator .................................................. 287
23.2. Low Power Internal Oscillator........................................................................ 287
23.3. External Oscillator Drive Circuit..................................................................... 287
23.3.1. External Crystal Mode........................................................................... 287
23.3.2. External RC Mode................................................................................. 289
23.3.3. External Capacitor Mode....................................................................... 290
23.3.4. External CMOS Clock Mode ................................................................. 290
23.4. Special Function Registers for Selecting and Configuring the 
System Clock ................................................................................................ 291
24. SmaRTClock (Real Time Clock).......................................................................... 295
24.1. SmaRTClock Interface .................................................................................. 296
24.1.1. SmaRTClock Lock and Key Functions.................................................. 297
24.1.2. Using RTC0ADR and RTC0DAT to Access SmaRTClock 
Internal Registers.................................................................................. 297
24.1.3. SmaRTClock Interface Autoread Feature ............................................. 297
24.1.4. RTC0ADR Autoincrement Feature........................................................ 297
24.2. SmaRTClock Clocking Sources .................................................................... 300
24.2.1. Using the SmaRTClock Oscillator with a Crystal or 
External CMOS Clock ........................................................................... 300
24.2.2. Using the SmaRTClock Oscillator in Self-Oscillate Mode..................... 301
24.2.3. Using the Low Frequency Oscillator (LFO) ........................................... 301
24.2.4. Programmable Load Capacitance......................................................... 301
24.2.5. Automatic Gain Control (Crystal Mode Only) and SmaRTClock 
Bias Doubling ........................................................................................ 302
24.2.6. Missing SmaRTClock Detector ............................................................. 304
24.2.7. SmaRTClock Oscillator Crystal Valid Detector ..................................... 304
24.3. SmaRTClock Timer and Alarm Function ....................................................... 304
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Rev. 1.0