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C8051F124-GQR Datasheet(PDF) 5 Page - Silicon Laboratories |
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C8051F124-GQR Datasheet(HTML) 5 Page - Silicon Laboratories |
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5 / 350 page  C8051F120/1/2/3/4/5/6/7 C8051F130/1/2/3 Rev. 1.4 5 13. Reset Sources....................................................................................................... 177 13.1.Power-on Reset.............................................................................................. 178 13.2.Power-fail Reset ............................................................................................. 178 13.3.External Reset ................................................................................................ 179 13.4.Missing Clock Detector Reset ........................................................................ 179 13.5.Comparator0 Reset ........................................................................................ 179 13.6.External CNVSTR0 Pin Reset ........................................................................ 179 13.7.Watchdog Timer Reset................................................................................... 179 13.7.1.Enable/Reset WDT ................................................................................ 180 13.7.2.Disable WDT .......................................................................................... 180 13.7.3.Disable WDT Lockout ............................................................................ 180 13.7.4.Setting WDT Interval .............................................................................. 180 14. Oscillators ............................................................................................................. 185 14.1.Internal Calibrated Oscillator .......................................................................... 185 14.2.External Oscillator Drive Circuit...................................................................... 187 14.3.System Clock Selection.................................................................................. 187 14.4.External Crystal Example ............................................................................... 190 14.5.External RC Example ..................................................................................... 190 14.6.External Capacitor Example ........................................................................... 190 14.7.Phase-Locked Loop (PLL).............................................................................. 191 14.7.1.PLL Input Clock and Pre-divider ............................................................ 191 14.7.2.PLL Multiplication and Output Clock ...................................................... 191 14.7.3.Powering on and Initializing the PLL ...................................................... 192 15. Flash Memory ....................................................................................................... 199 15.1.Programming the Flash Memory .................................................................... 199 15.1.1.Non-volatile Data Storage ...................................................................... 200 15.1.2.Erasing Flash Pages From Software ..................................................... 201 15.1.3.Writing Flash Memory From Software.................................................... 202 15.2.Security Options ............................................................................................. 203 15.2.1.Summary of Flash Security Options....................................................... 207 16. Branch Target Cache ........................................................................................... 211 16.1.Cache and Prefetch Operation ....................................................................... 211 16.2.Cache and Prefetch Optimization................................................................... 212 17. External Data Memory Interface and On-Chip XRAM........................................ 219 17.1.Accessing XRAM............................................................................................ 219 17.1.1.16-Bit MOVX Example ........................................................................... 219 17.1.2.8-Bit MOVX Example ............................................................................. 219 17.2.Configuring the External Memory Interface .................................................... 219 17.3.Port Selection and Configuration.................................................................... 220 17.4.Multiplexed and Non-multiplexed Selection.................................................... 222 17.4.1.Multiplexed Configuration....................................................................... 222 17.4.2.Non-multiplexed Configuration............................................................... 223 17.5.Memory Mode Selection................................................................................. 224 17.5.1.Internal XRAM Only ............................................................................... 224 17.5.2.Split Mode without Bank Select.............................................................. 224 |
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