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C8051F920-G-GQ Datasheet(PDF) 6 Page - Silicon Laboratories |
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C8051F920-G-GQ Datasheet(HTML) 6 Page - Silicon Laboratories |
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6 / 351 page  C8051F93x-C8051F92x 6 Rev. 1.4 18.7.Flash Error Reset ........................................................................................... 189 18.8.SmaRTClock (Real Time Clock) Reset .......................................................... 189 18.9.Software Reset ............................................................................................... 189 19. Clocking Sources ................................................................................................. 191 19.1.Programmable Precision Internal Oscillator ................................................... 192 19.2.Low Power Internal Oscillator......................................................................... 192 19.3.External Oscillator Drive Circuit...................................................................... 192 19.3.1.External Crystal Mode............................................................................ 192 19.3.2.External RC Mode.................................................................................. 194 19.3.3.External Capacitor Mode........................................................................ 195 19.3.4.External CMOS Clock Mode .................................................................. 196 19.4.Special Function Registers for Selecting and Configuring the System Clock 197 20. SmaRTClock (Real Time Clock) .......................................................................... 200 20.1.SmaRTClock Interface ................................................................................... 201 20.1.1.SmaRTClock Lock and Key Functions................................................... 201 20.1.2.Using RTC0ADR and RTC0DAT to Access SmaRTClock Internal Registers ..................................................................................................... 202 20.1.3.RTC0ADR Short Strobe Feature............................................................ 202 20.1.4.SmaRTClock Interface Autoread Feature .............................................. 203 20.1.5.RTC0ADR Autoincrement Feature......................................................... 203 20.2.SmaRTClock Clocking Sources ..................................................................... 206 20.2.1.Using the SmaRTClock Oscillator with a Crystal or External CMOS Clock ............................................................................ 206 20.2.2.Using the SmaRTClock Oscillator in Self-Oscillate Mode...................... 206 20.2.3.Programmable Load Capacitance.......................................................... 207 20.2.4.Automatic Gain Control (Crystal Mode Only) and SmaRTClock Bias Doubling ......................................................................................... 208 20.2.5.Missing SmaRTClock Detector .............................................................. 210 20.2.6.SmaRTClock Oscillator Crystal Valid Detector ...................................... 210 20.3.SmaRTClock Timer and Alarm Function ........................................................ 210 20.3.1.Setting and Reading the SmaRTClock Timer Value .............................. 210 20.3.2.Setting a SmaRTClock Alarm ................................................................ 211 20.3.3.Software Considerations for using the SmaRTClock Timer and Alarm . 211 21. Port Input/Output.................................................................................................. 216 21.1.Port I/O Modes of Operation........................................................................... 217 21.1.1.Port Pins Configured for Analog I/O....................................................... 217 21.1.2.Port Pins Configured For Digital I/O....................................................... 217 21.1.3.Interfacing Port I/O to 5 V and 3.3 V Logic............................................. 218 21.1.4.Increasing Port I/O Drive Strength ......................................................... 218 21.2.Assigning Port I/O Pins to Analog and Digital Functions................................ 218 21.2.1.Assigning Port I/O Pins to Analog Functions ......................................... 218 21.2.2.Assigning Port I/O Pins to Digital Functions........................................... 220 21.2.3.Assigning Port I/O Pins to External Digital Event Capture Functions .... 220 21.3.Priority Crossbar Decoder .............................................................................. 221 21.4.Port Match ...................................................................................................... 227 |
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