C8051F911 View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
C8051F911 Datasheet PDF : 318 Pages
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C8051F91x-C8051F90x
19.2.Low Power Internal Oscillator......................................................................... 180
19.3.External Oscillator Drive Circuit...................................................................... 180
19.3.1.External Crystal Mode............................................................................ 180
19.3.2.External RC Mode.................................................................................. 182
19.3.3.External Capacitor Mode........................................................................ 183
19.3.4.External CMOS Clock Mode .................................................................. 184
19.4.Special Function Registers for Selecting and Configuring the System Clock 185
20. SmaRTClock (Real Time Clock) .......................................................................... 188
20.1.SmaRTClock Interface ................................................................................... 189
20.1.1.SmaRTClock Lock and Key Functions................................................... 189
20.1.2.Using RTC0ADR and RTC0DAT to Access SmaRTClock
Internal Registers ................................................................................... 190
20.1.3.RTC0ADR Short Strobe Feature............................................................ 190
20.1.4.SmaRTClock Interface Autoread Feature .............................................. 190
20.1.5.RTC0ADR Autoincrement Feature......................................................... 191
20.2.SmaRTClock Clocking Sources ..................................................................... 194
20.2.1.Using the SmaRTClock Oscillator with a Crystal or
External CMOS Clock ............................................................................ 194
20.2.2.Using the SmaRTClock Oscillator in Self-Oscillate Mode...................... 195
20.2.3.Using the Low Frequency Oscillator (LFO) ............................................ 195
20.2.4.Programmable Load Capacitance.......................................................... 196
20.2.5.Automatic Gain Control (Crystal Mode Only) and
SmaRTClock Bias Doubling ................................................................... 197
20.2.6.Missing SmaRTClock Detector .............................................................. 199
20.2.7.SmaRTClock Oscillator Crystal Valid Detector ...................................... 199
20.3.SmaRTClock Timer and Alarm Function ........................................................ 199
20.3.1.Setting and Reading the SmaRTClock Timer Value .............................. 199
20.3.2.Setting a SmaRTClock Alarm ................................................................ 200
20.3.3.Software Considerations for using the SmaRTClock Timer and Alarm . 200
21. Port Input/Output.................................................................................................. 205
21.1.Port I/O Modes of Operation........................................................................... 206
21.1.1.Port Pins Configured for Analog I/O....................................................... 206
21.1.2.Port Pins Configured For Digital I/O....................................................... 206
21.1.3.Interfacing Port I/O to 5 V and 3.3 V Logic............................................. 207
21.1.4.Increasing Port I/O Drive Strength ......................................................... 207
21.2.Assigning Port I/O Pins to Analog and Digital Functions................................ 207
21.2.1.Assigning Port I/O Pins to Analog Functions ......................................... 207
21.2.2.Assigning Port I/O Pins to Digital Functions........................................... 208
21.2.3.Assigning Port I/O Pins to External Digital Event Capture Functions .... 208
21.3.Priority Crossbar Decoder .............................................................................. 209
21.4.Port Match ...................................................................................................... 215
21.5.Special Function Registers for Accessing and Configuring Port I/O .............. 217
22. SMBus ................................................................................................................... 225
22.1.Supporting Documents ................................................................................... 226
22.2.SMBus Configuration...................................................................................... 226
6
Rev. 1.0
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