C8051F90X datasheet(4/318 Pages) SILABS

Part #	C8051F90X

Description	Single/Dual Battery,0.9-3.6 V, 16-8 kB, SmaRTClock, 12/10-Bit ADC MCU

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Manufacturer	SILABS [Silicon Laboratories]

Direct Link	http://www.silabs.com

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C8051F91x-C8051F90x

4

Rev. 1.0

6.2. IREF0 Specifications......................................................................................... 87

7. Comparators ........................................................................................................... 88

7.1. Comparator Inputs ............................................................................................ 88

7.2. Comparator Outputs ......................................................................................... 89

7.3. Comparator Response Time............................................................................. 90

7.4. Comparator Hysteresis ..................................................................................... 90

7.5. Comparator Register Descriptions.................................................................... 91

7.6. Comparator0 and Comparator1 Analog Multiplexers........................................ 95

8. CIP-51 Microcontroller ........................................................................................... 98

8.1. Performance ..................................................................................................... 98

8.2. Programming and Debugging Support ............................................................. 99

8.3. Instruction Set ................................................................................................... 99

8.3.1. Instruction and CPU Timing ..................................................................... 99

8.4. CIP-51 Register Descriptions.......................................................................... 104

9. Memory Organization........................................................................................... 107

9.1. Program Memory ............................................................................................ 108

9.1.1. MOVX Instruction and Program Memory ............................................... 108

9.2. Data Memory .................................................................................................. 108

9.2.1. Internal RAM .......................................................................................... 108

9.2.2. External RAM ......................................................................................... 110

10. On-Chip XRAM...................................................................................................... 111

10.1.Accessing XRAM............................................................................................ 111

10.1.1.16-Bit MOVX Example ........................................................................... 111

10.1.2.8-Bit MOVX Example ............................................................................. 111

10.2.Special Function Registers............................................................................. 112

11. Special Function Registers ................................................................................. 113

11.1.SFR Paging .................................................................................................... 114

12. Interrupt Handler .................................................................................................. 120

12.1.Enabling Interrupt Sources ............................................................................. 120

12.2.MCU Interrupt Sources and Vectors............................................................... 120

12.3.Interrupt Priorities ........................................................................................... 121

12.4.Interrupt Latency............................................................................................. 121

12.5.Interrupt Register Descriptions ....................................................................... 123

12.6.External Interrupts INT0 and INT1.................................................................. 130

13. Flash Memory ....................................................................................................... 132

13.1.Programming The Flash Memory ................................................................... 132

13.1.1.Flash Lock and Key Functions ............................................................... 132

13.1.2.Flash Erase Procedure .......................................................................... 133

13.1.3.Flash Write Procedure ........................................................................... 133

13.2.Non-volatile Data Storage .............................................................................. 133

13.3.Security Options ............................................................................................. 134

13.4.Determining the Device Part Number at Run Time ........................................ 136

13.5.Flash Write and Erase Guidelines .................................................................. 137

13.5.1.VDD Maintenance and the VDD Monitor ............................................... 137

13.5.2.PSWE Maintenance ............................................................................... 138

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