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FX828D5 Datasheet(PDF) 7 Page - CML Microcircuits |
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FX828D5 Datasheet(HTML) 7 Page - CML Microcircuits |
7 / 34 page CTCSS/DCS/SELCALL Processor FX828 © 2009 CML Microsystems Plc 7 D/828/4 1.5 General Description The FX828 is a signalling encoder/decoder for use in land mobile radio equipment, see Figure 1. The transmitter section of this device has independently controllable tone generators for sub- audio (CTCSS) and inband (Selcall) signalling. It also features a DCS code generator, which may be used in place of the CTCSS tone generator. The receiver section of the FX828 has a fast/predictive CTCSS tone detector which operates in parallel with a DCS decoder and a CTCSS/Selcall tone decoder. The latter is switchable to perform either CTCSS or Selcall tone decoding of a user-programmable set of up to 15 tones. In the CTCSS mode it performs a more accurate (but slower) analysis of the tones detected by the fast/predictive CTCSS tone detector, which is a single detector that is switchable to provide either a fast response to any CTCSS tone (FAST DETECT mode) or a fast response to a single user- programmed CTCSS tone (PREDICTIVE mode). Other functions on the FX828 are a comparator with programmable threshold level, a general purpose timer and a summing amplifier with two adjustable gain blocks, which may be used for two point modulation, for example. All FX828 functions are controlled by an external µC over the C-BUS interface, a serial interface designed to reduce interference levels in radio equipment. 1.5.1 Software Description Address/Commands Instructions and data are transferred, via "C-BUS", in accordance with the timing information given in Figure 4. Instruction and data transactions to and from the FX828 consist of an Address/Command (A/C) byte followed by either: (i) a further instruction or data (1 or 2 bytes) or (ii) a status or Rx data reply (1 byte) |
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