CML Semiconductor Products
PRODUCT INFORMATION
Microprocessor Interface
Features/Applications
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0
0
FX203
Selcall Tone Codec with
Publication D/203/3 November 1998
Provisional Issue
Single-Chip Selcall Codec
CCIR, EEA or ZVEI/SZVEI
Versions
On-Chip General Purpose Timer
Separate General Purpose
4-bit input/2-bit Output Port
0 Mobile or Handheld Selcall
0 4-bit Microprocessor I/O Data Port
0 Powersave Facility
.
Uses Low-Cost 4MHz Xtal
0 Low-Power 5V CMOS Process
FX203
I -7g. 1 Internal Block Diagram
Brief Description
The FX203 is a single-chip ‘N’ tone Selective
Call encoder-decoder peripheral intended for
use with a host microprocessor. The device is
available in
3
toneset formats, CCIR, EEA or
ZVEIISZVEI.
-
_
A 4-bitdata I/O bus, 2-bit address, CS, R/W
and IRQ lines are provided for connection to
the microprocessor.
Separate general purpose 4-bit input and 2-bit
output ports are available to allow external
circuitry access to the microprocessor via this
device. Functions such as ‘PTT,’ ‘Rx Squelch,’
‘Alert Bleeps’ and ‘Lamp Drivers’ could operate
through this facility.
An on-chip general purpose timer is provided
for such functions as Rx and T
X
tone period
timing. Time periods of between 1 Oms and
140ms in 1 Oms steps may be programmed
via the microprocessor interface.
The FX203 reference oscillator utilizes a low-
cost 4.0 MHz Xtal or externally derived clock.
The divide by 4 (1 .O MHz) output may be
used to drive the clock circuitry of other
devices such as the FX365 CTCSS Encoder/
Decoder, FXO04 Voice Band Inverter, or the
FX214 VSB Audio Scrambler.
The FX203 requires a single 5volt supply and
utilizes ‘chip enable’/‘powersave’ facilities for
reduced current consumption in the Standby
mode.
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