AN494

Freescale Semiconductor Order this document by AN494/D Rev. 1 AN494 An HC11-Controlled Multiband RDS Radio Freescale Semiconductor, Inc... By Peter Topping Motorola, Ltd. East Kilbride, Scotland This application note describes the software and hardware features of the microcontroller (MCU) of a synthesized multiband radio which includes RDS (radio data system) decoding (FM, band II). It uses an MC68HC(7)11 MCU whose program can be on-chip or contained in an external EPROM (erasable programmable read-only memory). ROM versions are available. Both LCD (liquid crystal display) and VFD (vacuum fluorescent display) 16-character dot matrix display modules can be used to display RDS and tuning information. Traffic messages, initiated by the reception of EON (enhanced other networks) data (group 14B) or TA = TP = 1 (traffic announcement = traffic program = 1) on the current frequency, are handled. The station carrying the TA is tuned for the duration of the message, followed by a return to the original frequency. A tuning knob employing an incremental encoder is supported. Introduction Figure 1 shows a block diagram of the application. The controller hardware and software are described in detail here. The other hardware is not covered to the same depth, because that varies between different implementations, the intention being to describe a controller which could © Freescale Semiconductor, Inc., 2004. All rights reserved. © Motorola, Inc., 2001 For More Information On This P...