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Contents

1 Introduction 1

1.1 Wireless Microcontroller 1 1.2 Wireless Transceiver 1 1.3 RISC CPU and Memory 1 1.4 Peripherals 2 1.5 Block Diagram 3

2 Pin Configurations 4

2.1 Pin Assignment 5 2.2 Pin Descriptions 6 2.2.1 Power Supplies 6 2.2.2 Reset 6 2.2.3 16MHz System Clock 6 2.2.4 Radio 6 2.2.5 Analogue Peripherals 6 2.2.6 Digital Input/Output 7

3 CPU 8 4 Memory Organisation 9

4.1 ROM 10 4.2 RAM 10 4.3 External Memory 10 4.4 Peripherals 11 4.5 Unused Memory Addresses 11

5 System Clocks 12

5.1 16MHz Oscillator 12 5.2 32kHz Oscillator 12

6 Reset 13

6.1 Power-on Reset 13 6.2 External Reset 13 6.3 Software Reset 14

7 Interrupt System 15

7.1 System Calls 15 7.2 Processor Exceptions 15 7.2.1 Bus Error 15 7.2.2 Alignment 15 7.2.3 Illegal Instruction 15 7.3 Hardware Interrupts 16

8 Wireless Transceiver 17

8.1 Radio 17 8.1.1 Radio External components 18 8.2 Modem 18 8.3 Baseband Processor 19 8.3.1 Transmit 19 8.3.2 Reception 20 8.3.3 Auto Acknowledge 20
ii JN-DS-JN5121 v1.8 © Jennic 2007 Preliminary