C8051F321-GMR Datasheet, PDF (4/250 Pages) Silicon Laboratories – Full Speed USB, 16 k ISP FLASH MCU Family

C8051F320/1
9.2.7. Register Descriptions ............................................................................... 83
9.3. Interrupt Handler ............................................................................................... 87
9.3.1. MCU Interrupt Sources and Vectors ........................................................ 87
9.3.2. External Interrupts .................................................................................... 88
9.3.3. Interrupt Priorities ..................................................................................... 88
9.3.4. Interrupt Latency ...................................................................................... 89
9.3.5. Interrupt Register Descriptions................................................................. 90
9.4. Power Management Modes .............................................................................. 97
9.4.1. Idle Mode.................................................................................................. 97
9.4.2. Stop Mode ................................................................................................ 97
10. Reset Sources ....................................................................................................... 99
10.1.Power-On Reset ............................................................................................. 100
10.2.Power-Fail Reset / VDD Monitor .................................................................... 101
10.3.External Reset ................................................................................................ 102
10.4.Missing Clock Detector Reset ........................................................................ 102
10.5.Comparator0 Reset ........................................................................................ 102
10.6.PCA Watchdog Timer Reset .......................................................................... 102
10.7.Flash Error Reset ........................................................................................... 102
10.8.Software Reset ............................................................................................... 103
10.9.USB Reset...................................................................................................... 103
11. Flash Memory ..................................................................................................... 106
11.1.Programming The Flash Memory ................................................................... 106
11.1.1.Flash Lock and Key Functions ............................................................... 106
11.1.2.Flash Erase Procedure .......................................................................... 106
11.1.3.Flash Write Procedure ........................................................................... 107
11.2.Non-volatile Data Storage .............................................................................. 107
11.3.Security Options ............................................................................................. 108
11.4.Flash Write and Erase Guidelines .................................................................. 110
11.4.1.VDD Maintenance and the VDD Monitor ............................................... 110
11.4.2.16.4.2 PSWE Maintenance .................................................................... 111
11.4.3.System Clock ......................................................................................... 111
12. External RAM ...................................................................................................... 114
12.1.Accessing User XRAM ................................................................................... 114
12.2.Accessing USB FIFO Space .......................................................................... 114
13. Oscillators ............................................................................................................. 116
13.1.Programmable Internal Oscillator ................................................................... 116
13.1.1.Programming the Internal Oscillator on C8051F320/1 Devices ............. 117
13.1.2.Internal Oscillator Suspend Mode .......................................................... 118
13.2.External Oscillator Drive Circuit...................................................................... 119
13.2.1.Clocking Timers Directly Through the External Oscillator...................... 119
13.2.2.External Crystal Example....................................................................... 119
13.2.3.External RC Example............................................................................. 120
13.2.4.External Capacitor Example................................................................... 120
13.3.4x Clock Multiplier .......................................................................................... 122
13.4.System and USB Clock Selection .................................................................. 123
4
Rev. 1.4