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8.3.4 Beacon Generation 20 8.3.5 Security 20 8.4 Security Coprocessor 20

IEEE802.15.4 / ZigBee Wireless MicrocontrollersR - 34237 9 Digital Input/Output 22 10 Serial Peripheral Interface 23

10.1 Programming Example 25

11 Intelligent Peripheral Interface 27

11.1 Data Transfer Format 27 11.2 JN5121 Initiated Data Transfer 28 11.3 Remote Processor Initiated Data Transfer 28

12 Timers 29

12.1 Peripheral Timer / Counters 29 12.1.1 Pulse Width Modulation Mode 30 12.1.2 Capture Mode 30 12.1.3 Counter / Timer Mode 31 12.1.4 Delta-Sigma Mode 31 12.1.5 Timer / Counter Application 32 12.2 Tick Timer 33 12.3 Wakeup Timers 34 12.3.1 RC Oscillator Calibration 34

13 Serial Communications 35

13.1 Interrupts 36 13.2 UART Application 36 13.3 Programming Example 37

14 Two-Wire Serial interface 38

14.1 Connecting Devices 39 14.2 Multi-Master Operation 39 14.3 Clock Stretching 40 14.4 Programming Example 40

15 Analogue Peripherals 42

15.1 Analogue to Digital Converter 43 15.1.1 Operation 43 15.1.2 Supply Monitor 43 15.1.3 Temperature Sensor 43 15.1.4 Programming Example 44 15.2 Digital to Analogue Converter 44 15.2.1 Operation 44 15.2.2 Programming Example 45 15.3 Comparator 45

16 Power Management and Sleep Modes 46

16.1 Power Domains 46 16.2 Sleep Modes 46 16.2.1 CPU Doze 46 16.2.2 Sleep 46 16.2.3 Deep Sleep 46
© Jennic 2007 JN-DS-JN5121 v1.8 iii