Datasheet

ST7538Q Functional description
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Figure 19. XIN waveform if an external oscillator is used
5.10 Control register
The ST7538Q is a multi-channel and multifunction transceiver. An internal 24 or 48 Bits (in
Extended mode) Control Register allows to manage all the programmable parameters
(Tabl e 1 1 ).
The programmable functions are:
● Channel Frequency
● Baud Rate
● Deviation
● Watchdog
● Transmission Timeout
● Frequency Detection Time
● Detection Method
● Mains Interfacing Mode
● Output Clock
● Sensitivity Mode
● Input Pre-Filter
In addition to these functions the Extended mode provides 24 additional bits and others
functions:
● Output Level Freeze
● Frame Header Recognizer (one 16 bits header of or two 8 bits headers) with support to
Frame Length Bit count