User's Manual
Table Of Contents
- 1. Overview
- 2. Applications
- 3. Features
- 4. Technical data
- 5. Mechanical size
- 6. Soldering profile
- 7. Pin assignment
- 8. PCB design
- 9. Clock
- 10. Application circuits
- 11. Programming
- 12. Pre-flashed firmware
- 13. Adapter boards
- 14. Radio certification
- 15. Ordering information
- 16. Packaging dimension
- 17. Revision notes
- 18. References
User Manual
Version 1.1c
2013-07-01
OEM radio modules deRFmega
www.dresden-elektronik.de
Page 41 of 52
9. Clock
The radio module contains an onboard 32.768 kHz 20 ppm quartz crystal for the MCU and a
16.000 MHz 10 ppm quartz crystal for the internal transceiver. For optimum RF timing
characteristics it is necessary to use a low tolerance crystal. The watch crystal clocks a timer,
not the processor. The timer is intended to wake-up the processor periodically.