C8051T630 Datasheet, PDF (4/221 Pages) Silicon Laboratories – Mixed-Signal Byte-Programmable EPROM MCU

C8051T630/1/2/3/4/5
15. Interrupts ................................................................................................................ 80
15.1. MCU Interrupt Sources and Vectors................................................................ 81
15.1.1. Interrupt Priorities.................................................................................... 81
15.1.2. Interrupt Latency ..................................................................................... 81
15.2. Interrupt Register Descriptions ........................................................................ 82
15.3. INT0 and INT1 External Interrupts................................................................... 87
16. EPROM Memory ..................................................................................................... 89
16.1. Programming and Reading the EPROM Memory ........................................... 89
16.1.1. EPROM Write Procedure ........................................................................ 89
16.1.2. EPROM Read Procedure........................................................................ 90
16.2. Security Options .............................................................................................. 90
16.3. Program Memory CRC .................................................................................... 91
16.3.1. Performing 32-bit CRCs on Full EPROM Content .................................. 91
16.3.2. Performing 16-bit CRCs on 256-Byte EPROM Blocks............................ 91
17. Power Management Modes................................................................................... 92
17.1. Idle Mode......................................................................................................... 92
17.2. Stop Mode ....................................................................................................... 93
17.3. Suspend Mode ................................................................................................ 93
18. Reset Sources ........................................................................................................ 95
18.1. Power-On Reset .............................................................................................. 96
18.2. Power-Fail Reset/VDD Monitor ....................................................................... 97
18.3. External Reset ................................................................................................. 98
18.4. Missing Clock Detector Reset ......................................................................... 98
18.5. Comparator0 Reset ......................................................................................... 99
18.6. PCA Watchdog Timer Reset ........................................................................... 99
18.7. EPROM Error Reset ........................................................................................ 99
18.8. Software Reset ................................................................................................ 99
19. Oscillators and Clock Selection ......................................................................... 101
19.1. System Clock Selection................................................................................. 101
19.2. Programmable Internal High-Frequency (H-F) Oscillator .............................. 103
19.2.1. Internal Oscillator Suspend Mode ......................................................... 103
19.3. Programmable Internal Low-Frequency (L-F) Oscillator ............................... 105
19.3.1. Calibrating the Internal L-F Oscillator.................................................... 105
19.4. External Oscillator Drive Circuit..................................................................... 106
19.4.1. External RC Example............................................................................ 108
19.4.2. External Capacitor Example.................................................................. 108
20. Port Input/Output ................................................................................................. 109
20.1. Port I/O Modes of Operation.......................................................................... 110
20.1.1. Port Pins Configured for Analog I/O...................................................... 110
20.1.2. Port Pins Configured For Digital I/O...................................................... 110
20.1.3. Interfacing Port I/O to 5V Logic ............................................................. 111
20.2. Assigning Port I/O Pins to Analog and Digital Functions............................... 112
20.2.1. Assigning Port I/O Pins to Analog Functions ........................................ 112
20.2.2. Assigning Port I/O Pins to Digital Functions.......................................... 112
20.2.3. Assigning Port I/O Pins to External Digital Event Capture Functions ... 113
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Rev. 1.0