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C8051F912-D-GDI Datasheet(PDF) 6 Page - Silicon Laboratories |
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C8051F912-D-GDI Datasheet(HTML) 6 Page - Silicon Laboratories |
6 / 335 page C8051F91x-C8051F90x 6 Rev. 1.3 19.1.Programmable Precision Internal Oscillator ................................................... 186 19.2.Low Power Internal Oscillator......................................................................... 186 19.3.External Oscillator Drive Circuit...................................................................... 186 19.3.1.External Crystal Mode............................................................................ 186 19.3.2.External RC Mode.................................................................................. 188 19.3.3.External Capacitor Mode........................................................................ 189 19.3.4.External CMOS Clock Mode .................................................................. 189 19.4.Special Function Registers for Selecting and Configuring the System Clock 190 20. SmaRTClock (Real Time Clock) .......................................................................... 193 20.1.SmaRTClock Interface ................................................................................... 194 20.1.1.SmaRTClock Lock and Key Functions................................................... 194 20.1.2.Using RTC0ADR and RTC0DAT to Access SmaRTClock Internal Registers 195 20.1.3.RTC0ADR Short Strobe Feature............................................................ 195 20.1.4.SmaRTClock Interface Autoread Feature .............................................. 195 20.1.5.RTC0ADR Autoincrement Feature......................................................... 196 20.2.SmaRTClock Clocking Sources ..................................................................... 199 20.2.1.Using the SmaRTClock Oscillator with a Crystal or External CMOS Clock . 199 20.2.2.Using the SmaRTClock Oscillator in Self-Oscillate Mode...................... 200 20.2.3.Using the Low Frequency Oscillator (LFO) ............................................ 200 20.2.4.Programmable Load Capacitance.......................................................... 201 20.2.5.Automatic Gain Control (Crystal Mode Only) and SmaRTClock Bias Dou- bling ..................................................................................................... 202 20.2.6.Missing SmaRTClock Detector .............................................................. 204 20.2.7.SmaRTClock Oscillator Crystal Valid Detector ...................................... 204 20.3.SmaRTClock Timer and Alarm Function ........................................................ 204 20.3.1.Setting and Reading the SmaRTClock Timer Value .............................. 204 20.3.2.Setting a SmaRTClock Alarm ................................................................ 205 20.3.3.Software Considerations for using the SmaRTClock Timer and Alarm . 205 21. Port Input/Output.................................................................................................. 210 21.1.Port I/O Modes of Operation........................................................................... 211 21.1.1.Port Pins Configured for Analog I/O....................................................... 211 21.1.2.Port Pins Configured For Digital I/O....................................................... 211 21.1.3.Interfacing Port I/O to 5 V and 3.3 V Logic............................................. 212 21.1.4.Increasing Port I/O Drive Strength ......................................................... 212 21.2.Assigning Port I/O Pins to Analog and Digital Functions................................ 212 21.2.1.Assigning Port I/O Pins to Analog Functions ......................................... 212 21.2.2.Assigning Port I/O Pins to Digital Functions........................................... 213 21.2.3.Assigning Port I/O Pins to External Digital Event Capture Functions .... 213 21.3.Priority Crossbar Decoder .............................................................................. 214 21.4.Port Match ...................................................................................................... 220 21.5.Special Function Registers for Accessing and Configuring Port I/O .............. 222 22. SMBus ................................................................................................................... 230 22.1.Supporting Documents ................................................................................... 231 |
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