FX828 Datasheet, PDF (22/34 Pages) CML Microcircuits – CTCSS/DCS/SELCALL Processor

CTCSS/DCS/SELCALL Processor
FX828
1.6.6 General Purpose Timer (GPT)
This may be used in conjunction with the CTCSS/Selcall decoder to form part of the decode algorithm or
as a timer for any other purpose. It has an 8-bit value in the GENERAL PURPOSE TIMER Register ($8B)
set in units of 1msec, an IRQ FLAG in Bit 6 of the IRQ FLAG Register ($8F) and an IRQ MASK in Bit 6 of
the IRQ MASK Register ($8E).
1.6.7 Full Duplex Modes
The only functions that must operate as half duplex are:
DCS Tx
or DCS Rx
DCS Tx
or CTCSS Tx
CTCSS decode or SELCALL decode
All other functions are totally independent and therefore a full duplex CTCSS or full duplex SELCALL
along with many other combinations are possible.
© 2009 CML Microsystems Plc
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